#help-0
1 messages · Page 472 of 1
Closed due to timeout
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
been stuck here for 3 hours and no YouTube tutorial has helped me lmao
would converting 1-cos to 1-sin(x/2) would do the trick?
are you allowed to use substitution? w = 1/x, then yea this could work
@hot sleet Has your question been resolved?
Closed due to timeout
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
I have some questions regarding the differential equation problem.
However, when i asked wolfram to solve it gave a very different result.
What did i missed on this one?
@wheat pendant Has your question been resolved?
<@&286206848099549185>
the previous -2 became a +2
OH MY GOD
but using the reduction order doesn't require that term
isnt it?
since y1 already present which i need to only get y2 to get the general solution
i don't know the reduction of order technique you learned
this is the one i'm familiar with https://tutorial.math.lamar.edu/Classes/DE/ReductionofOrder.aspx
In this section we will discuss reduction of order, the process used to derive the solution to the repeated roots case for homogeneous linear second order differential equations, in greater detail. This will be one of the few times in this chapter that non-constant coefficient differential equation will be looked at.
which requires you to solve for a v(t) that equals to y_2(t) = v(t) * (known solution)
Closed by @wheat pendant
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
Task in text form: Given a rectangle ABCD inscribed in a circle ω with center O. The line ℓ
passes through O and intersects the segments BC and AD at points
E and F, respectively. The points K and L are the points of intersection of ℓ and ω, with the points K, E,
F, L lying in that order on the line ℓ. The lines tangent to ω at points
K and L intersect the line CD at points M and N, respectively. Prove that the points E, F, M, N lie on the same circle.
S is the center of circle which existance should be proved, figured it out in geogebra just to make drawing a proof a bit more convenient
what I figured out so far:
- obviously LN and KM are parallel
- using the Thales's theorem I can prove, that if I draw the circle with the diameter MN and center S and draw parallel to LN going through O, it will also go through S.
So I can tell that ES=FS and MS=NS, so now I only need to prove that ES=MS or FS=NS. - Through geogebra I figured out that ∠OSE = ∠CME - ∠EMK = const for the same rectangle
And after this I couldn't come up with anything that can help me.
I can send the geogebra file here if somebody needs it and if I'm allowed to.
could u send me a geogebra link?
actually, I don't have an account, I can only send file. I don't know if I'm allowed to send it in this channel, I could send it to you in DM
ah nw it's fine
so, do you want me to send it in DM?
I just click open and there is local file button
i have to go now, i'll think abt this when i'm back
okay 👊
i'd like to preface this by saying that i really really suck at olympiad geometry
but just an observation
CMKE and NBFL are cyclic
me too, the worst thing I can imagine is geometry and probability
so can we use that to angle chase DNF etc.?
ye, I figured it out too, but couldn't come up with idea how to use that
can't tell if I already tried that, but I'll try this anyway
thx for idea
@timber jungle Has your question been resolved?
ok so if u angle chase correclty
you get that the question is equivalent to proving that AL = BK
which is true
but... isn't AL almost always not equal to BK because of the angle of line l?
for example on the drawing I made AL is longer than BK
Maybe I'm missing something and I made a bad drawing
oh wait i've might not have the right labellings
oh yeah my points are labelled badly lol
lemme relabel my points 1 sec
right ok so i'll walk u through my thought process
first piece of advice is to generally not add in circle EFMN
sometimes adding in the circle can be useful but here i think it clutters the diagram
so there's many ways to show something is cyclic
for example, if we could prove NFE + NME = 180 we'd be done
now think about why that is equivalent to proving that NFD = EMK
did that make sense @timber jungle ?
no, but I'm trying to understand this
Okay, my guess is that if those angles are equal, that means that △NDF~△EMK and that should mean somehow that △NLF~△CME. If △NLF~△CME, I wrote few equations and I proved that NFE + NME = 180 @tiny sky
But now I don't really understand how to prove that △NLF~△CME and the original statement that NFD = EMK, but I'm on my way to understand this
okay, I managed to prove that △NLF~△CME. Now everything you said makes sense @tiny sky
The only thing left is to prove that NFD = EMK
i mean it's actually a lot more simpler
DFE + FEC = 180
FEC = KMC
so then look at that and realise that that's equivalent to NFD = EMK
anyway once we have this, NFD = NLD = angle subtended by NL
EMK = ECK = BCK = angle subtended by BK
so it suffices ot show BK = DL
which is true by symmetry/drawing in a few lines to show that 2 triangles are congruent
hope that all made sense @timber jungle
welp, I'm processing it :D
Rn I'm trying to understand why you said this:
that's equivalent to NFD = EMK
I've used the fact that FEC = KMC in writing some equations, but that didn't lead me directly to saying that NFD = EMK
well then DFE + KMC = 180
KMC = EMC + KME
DFE = NFE - NFD
so EMC + NFE + (KME - NFD) = 180
so suffices to show KME - NFD = 0
okay, now I understand how you proved that KME + NFD and proving that 2 triangles are congruent
that makes sense
so how would you prove that NFE + NME = 180 because of that?
^
man, you're writing in an occupied
oops
@timber jungle Has your question been resolved?
I thought I understand, but I don't. So from your equation to prove that KME = NFD, EMC + NFE should be equal to 180, so that we can get KME - NFD = 0
But I can't find when did we get this information and if we have this info, we are already done because EMC = NME
And I don't really understand the part with the triangles, what are you trying to prove with those triangles? And am I getting this right, you proved that △DFL = △BKE?
Sorry to bother you for such a long time, it's just difficult for me to understand this
we're not doing anything with triangles?
we start with this
okay, seems like I'll just need to try to rethink it a hundred times more tomorrow until I get it. Anyway, thank you very much for helping me out, at least I'm not stuck anymore @tiny sky
.close
Closed by @timber jungle
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
Ik that the sqrt of 65 is about 8, but with the negative in front of the sqrt symbol, if I keep -8 it won't work because -8 squares is positive 64
for 22
<@&286206848099549185>
<@&286206848099549185>
chill your pings
ok
help
ok
First, that square root is closer to 9 than it is to 8
how
And second, fairly sure that - was there just so you had to write -9 instead of 9, from the looks of it, you haven't taken complex numbers, which would be needed to get a negative result when squaring
@round zealot Has your question been resolved?
Closed due to timeout
Use .reopen if this was a mistake.
.reopen
✅
.close
Closed by @round zealot
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
Hi
Can i get help on these two plz. Im very confused
Plz @ me when responding. Thanks
<@&286206848099549185>
.reopen
For the first, you might want to consider difference of cubes…
For the second, consider that as x is going to infinity, you can consider x positive, and compare the numerators and denominators 
I thought of this
Still cant do it @pseudo ice
😭
Of which one? Both of them?
Workin
On first rn
Rlly need help wit it. Been doing it for a while
@pseudo ice
Im tryinh to factor an x from numerator right?
If you can make a factor of x appear in the numerator appear, yep
Right, you’re happy that the general difference of two cubes is
[
(a - b)(a^2 + ab + b^2) = a^3 - b^3
]
@pseudo ice
I did that but then do i like multiply it out?
Well, we have cube roots, and somehow want to get rid of them
My teacher recommended thid
This
And said to use the formula
Idk where to go from here
Yep, so notice how our numerator is (a - b) right now, if we multiplied it by something, we would turn it into (a^3 - b^3)
Noooo 
What would you have to multiply (a - b) by, to get (a^3 - b^3)?
No
@pseudo ice
Oh im dumb
Its the other part of the formula
Asquared plus ab plus b squared
Y do we want to multiply by this tho? What is being accomplished by getting a cubed minus b cubed?
Yep, you’d need to multiply by that, but of course if we multiply by it, we also need to divide by it too
And work out what a^3 - b^3 is 
Im confused y we need that
This
Did you work out what it turns into?
Not yet lemme do that so multiply top and bottom? @pseudo ice
Yep, multiply top and bottom by that a^2 + ab + b^2
K one second
You know the numerator becomes a^3 - b^3, so then check what that is with your choices of a and b
You don’t need to really expand it out, just leave it as x(a^2 + ab + b^2) and then cancel the x in the denominator with the x you get from the numerator
Ohhhhh
Ur right
Can we do second one together ur rlly good help btw
@pseudo ice
Sure 
Thx alr lemme just right answee for first one
@pseudo ice ok moving onto next one
Not rlly sure where to start ngl
Divide everything by highest power of x?
Well, I mean, you could, if you’re careful about it-
As the limit of x is going to infinity, we can safely assume x is positive
Now, if x is positive, what’s sqrt{x^2}?
,rccw
x
Cool, so what’s the “highest power” of the denominator?
I think i would need to divide everything right?
So would i divide by x or x squared @pseudo ice
I see the highest power is x squared but it rlly is just x
@pseudo ice
Is this right?
Yep, the highest power is basically x, so divide both top and bottom by x
Then use the fact you have x as sqrt{x^2} to simplify the insides of the root
Well, yea, you can either factor x^2 from the root and pull it out, or equivalently divide the insides of the root by x^2 and the numerator by x
@pseudo ice can i take out 9x squared?
You could if you wanted to, sure 
Wait but i have a question
Can u always take out a term if it is able to from under a square root. For example: root of 9-5 is 2 but then if u favtor out 9 first then its 3 times root of negatuve 5
@pseudo ice
I always get confused on this
Well, if you factor 9 out, it’s 3 * sqrt{1 - 5/9}, which works out as 3 * sqrt{4/9}
And of course sqrt{4/9} is 2/3
Wait can u say tht more simply @pseudo ice
Like clearly
Where do u get 5/9 from
And 4/9
I dont think i can factor is out @pseudo ice
Because you're factoring the insides, you first need to factor a 9 from 9 - 5
And as 9 - 5 = 9(1 - 5/9), as you have to divide the "other term" by 9
O ya. I think i have had too much math for today. After this question i will stop
So i will go ahead and factor the x on’y
@pseudo ice o wait but if i factored 9 it would be just a negative under tje root
O wait no
Nvm
1
- whatever
-*
Remember that if you factor, you have to divide everything by what you're factoring out
So like if you factored an a from a^2 + 3a, you get a(a + 3)
so the a^2 gets divided by a, and the 3a gets divided by a too
Not quite, no
New question, can you factor an $x^2$ from the expression $9x^2 - 5x$? bear this in mind
@pseudo ice
Oh no u can’t
@pseudo ice
So i cant take anything out of root?
@pseudo ice
@pseudo ice im stuck
Can u explain what and why ur supposed to do
You can either factor out an x^2, or a 9x^2, out of the root, because you know you can square root those
But u said u cant factor
You can factor an x^2 from this expression, it just doesn’t look as nice and you will have fractions in it
X squared
True
Ok i will do that rn
Ill do one step at a time and then send to y
U
Like this?
Sorry x
Not x squared
Outside
Wait a minute
I think i screwed it up
Yep, better 
Is this right?
Yep, with x on the outside of the root, it is 
Now, if you factor an x from the numerator too, that x + 3, in a similar manner
How do u factor an x from numerator
There is one x
Alright, new move then-
Rewrite this as $\frac{ (x + 3)/x }{ \sqrt{9 - \frac5x} }$ and work out that $\frac{x + 3}x$ in the numerator
@pseudo ice
How does the x move to numerator @pseudo ice
You are aware of how to manipulate fractions, such as the fact that $\frac{a/b}c = \frac{a}{bc}$ right
@pseudo ice
Well, going backwards is dividing both numerator and denominator by b
Are we able to do this way @pseudo ice ?
Like divide by x highest power?
My teacjer will mark us like this
It’s literally what we are doing, the highest power of both the numerator and denominator is x
You just need to know how to work with roots and how they simplify
,rotate
There was an x outside the root which you’re forgetting about
It cancels with the x you’re dividing by
Correct, don’t have the /x for the denominator
\frac{1}{\sqrt{9-\frac{5}{x}}\cdot\frac{x}{x}+\frac{3}{x}
Wait like what i have rn is correct or no? @pseudo ice
Sorry not trying to take up space
do you wanna take over explaining, by any chance? 
Yeah I was trying to format it for them
$\frac{1}{\sqrt{9-\frac{5}{x}}\cdot\frac{x}{x}+\frac{3}{x}$
Can you by chance check my code
@pseudo ice am i close to finishing?
You're 1-2 steps away
Alr
You’re missing one closing } after the one for the sqrt
The one so you have the denominator of the first \frac
I tried that in the latex test channel and its still messed up
(Tl;dr “what happens to this as x gets larger and larger?”)
$\frac{1}{ \sqrt{9-\frac{5}{x}} }\cdot\frac{x}{x}+\frac{3}{x}$
@pseudo ice
Closer to 0?
O wait closer to
…
1/3???
\frac{1}{ \sqrt{9-\frac{5}{x}} }\cdot(\frac{x}{x}+\frac{3}{x})
Yes
Put it in an equation environment?
Closed by @strong night
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
Channel closed due to the original message being deleted.
If you did not intend to do this, please open a new help channel,
as this action is irreversible, and this channel may abruptly lock.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
@dim junco Has your question been resolved?
if so then yea looks fine
Architect
not really. you can just take whatever term in the tail (say the first one)
Architect
for any k, x^k/k! is unbounded
by taking limit as x goes to infinity
so just set k = n + 1
this sum will be greater than x^(n+1)/(n+1)!
(if x > 0)
yep
Architect
:bending_skull:
the sup of a function over a set is like the "largest" (but not quite that, there might not be a largest even if there is a sup) value the function takes over the set
Closed due to timeout
Use .reopen if this was a mistake.
what i mean by that is e.g. $\sup_{x\in (0,1)} 2x = 2$ but $2x$ isn't ever 2 for any $x\in (0,1)$
:bending_skull:
but largest is a good intuitive way to think of it
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
Yo hello mu friends
what is your current level of mathematics education?
you can answer this by listing the last few math courses you have taken or the current math course you are enrolled in
https://www.khanacademy.org/math may be a useful resource
Closed by @fervent rampart
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
bro 💀
cooked
i went in here to ask for help w actual math probelms theres no way u need help w this wtf
is this not common sense like u could have never taken gemoetry and still understand this i would think
no u j have to go thru it it takes like 5-10 min for me to do that easy but a waste of time for me
im sure theres a lot of nerds in here happy to help
<@&268886789983436800> this dudes being an arsehole
so its too hard for you to solve?
don't be rude to other users please
the person i said that to wasnt offended i didnt really say anything bad just sorta banter no need to be so sensative what u consider rude isnt subjective and if that guy i said it to has no issue w that i said then i wasnt being rude

don't tell people in the help channels that the thing that they're struggling with is easy.
is that better?
like im not trying to be problematic i j joined for help w a math problem and saw an easy problem and gave him some shit for it but nothing serious its really sensative and sad that society is so sensative that telling someone that a literal math problem is easy offends someone i wont say it and ill follow ur communist rules to not get banned but u should stand up for whats right and moderate fairly.
Oh good lord 🤣
like the person i said it to is literaly putting cat memes at it he doesnt care so im just confused why u as a mod felt the need to say anything about it
and even more confused why this guy felt the need to step in
congratulations, you just spent the 10 minutes that you said it would take to solve that problem on arguing with a highschooler
good job
like ik im making a big deal abt it but theres no way that u guys responding to it dont see my point thats why i argued abt it sm baffels me that ppl r like this
can we keep it on-topic please - I think I'm done here
the topic was my comment and discussing weather or not it was wrong so isnt that on topic?
i dont appreciate how u as a mod are just ignoring my feedback on what happened
okay, dm @fierce herald if you have issues with the way I carry out the role.
can we please get back on-topic now?
yeah
i was thrown this question in my math with no explaination on how to solve it
i dont have big enough issues of how u carry out the role to message mod mail its just not okay how u do this and dont care about being unfair and when i call it out u laugh at it but anyways since u wanna be like that then please answer this at least mod person how do i make a thingy thing to ask my math question?
it's laid out in #❓how-to-get-help
can you just quit the yappin and go do something useful? you have a lot better to do then argue with a high schooler yk
taking a few mintues to argue with someone while im doing a math assignemnt is considered useful to me since it doesnt take that much time and i do it to try and understand where lower intelligent indivisuals are coming from sometimes i like to understand others povs cus for ex i genuinely cannot fathom how someone that has nothing to do w me or u can look at me basically telling u that ur math problem is easy and then be like OMG DID THIS PERSON JUST CALL A MATH PROBLEM EASY AND MAKE A JOKE OMGGG I NEED TO TAG A MOD THAT IS SO WRONG like its crazy anyone is like that i was arguing to try to understand their pov but they just ignored all the logic i was spitting back at them becasue i dont even think they understood why they got upset themselves
what the sigma
please just drop it. this isn't the place to argue with me, there are other avenues for that. I'm gonna just mute you if you continue to say off-topic things.
what have you accomplished by arguing with me
W
excuse me but jmao is the one arguing w me and im responding so tell that to him to please this is not me arguing with you just standing up for u only enforcing rules on me and not jmao
Please mute 'em
yeah im done
come back later.
for reference for people coming in: here is the original problem, no progress has been made yet
<@&286206848099549185>
Ok
ignore everything in between the problem i posted and smay's last message
are you familiar with what a tangent is and some of the properties of tangents?
not really no :/
my math program tends to explain things very simply and make hard problems
well in short, a line or line segment "is tangent" to a circle if it intersects it at a single point
alr
so you can think of that as just grazing the outside of the circle, but not passing through the interior area
so like the line AD or AB?
right, we can say those line segments are tangent to the circle
okay
one of the key properties with tangents is that if you draw a radius of the circle from the point where they hit the circle, the radius and the tangent line \ segment will form a right angle
do you really expect helpers should know what (for example) "Axiom 4 (Lesson 7)" means?
so for example you can see segment AB here is part of a line that intersects the circle at a single point
and if O is the center of the circle, then angle ABO will be a right angle
huh ok
he seems to understand it pretty well so yeah
so summary so far:
- tangents intersect a circle at a single point, "grazing the outside"
- they form right angles with some radius of the circle at the point of tangency
btw in that problem you showed, are you also supposed to change the order of the different steps?
because AB ~= AD doesn't really seem like the first step in the proof
its just a drop down menu to select which one defines the step best
confusing because for the AB congruent to AD step i would think you would have to establish that BE congruent to ED first, but that step is further down
reposting so don't have to scroll up
so anyway, you chose circle definition for step 2, why was that? can you maybe show list of available options and think a bit more \ reconsider what you think it might be?
I'd assume the "tangent segment theorem" has something to do with that
so if you don't know what any of these options mean, you probably won't be able to answer the question. so if that theorem sounds unfamiliar, can you look it up in your book or wikipedia as you want and see what it means?
what does tangent segment theorem state?
(the question is kinda terrible because of it, since the proof of that theorem - if I understand what it is - uses triangle congruency...)
i think im just gonna skip the question
i did crap on the first half of the lesson so i just gotta pray for higher than 80
***so if you don't know what any of these options mean, you probably won't be able to answer the question. ** thats what i meant before. anyway.
why? because you don't wnat to bother looking through your book on what the different names mean? 🤔
i dont have a book its video lectures
anyways i skipped the question and i got a 66 😭
technically i passed
really, introductory math classes with no book? sigh
that's pretty atrocious
do you take notes while watching the lectures?
i dont know what i need to do after having found the dimension of the big rectangle (4x+1)(5x+2)
!occupied
Someone else is already using this help channel. If you need help with a question, please open your own help channel/thread (see #❓how-to-get-help for instructions).
oh sorry i though it was a general help channel i didnt know it was for one person at the time
@tawny imp Has your question been resolved?
Closed by @tawny imp
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
!status
What step are you on?
1. I don't know where to begin.
2. I have begun but got stuck midway.
3. I got an answer but I was told that it's wrong.
4. I got an answer and would like my work checked.
5. I have a question about someone else's work/solution.
6. I have completed the problem and don't need help anymore. Thank you.
7. None of the above
1
Replace A with B-d
And C with B+d
Then use sine sum and difference formulas
Closed by @velvet light
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
hi
i am not really familiar with the english vocabulary for structures so please excuse me
i found that A5 , the group of even permutations of 5 elements is of the order of 60
and even though 6 devise 60 there exist no sub group of the 6th order
but couldn't we consider the group generated by (12) and (345)
since they can commute with each other we can consider it isomorphe with Z/3Z x Z/2Z
(12) is not an even permutation
that does not mean that A5 doesn't have a subgroup of order 6, though.
you can consider <(123), (12)(45)> and that's a subgroup of A5 with order 6 👍
thanks!
but then since we've got cauchy's theorem that state that for every prime divisor of the order of the set there exist a sub group of that order
this means that there are non prime divisors of this order where there doesn't exist a subgroup of that order
this was actually one of my past exam questions :0
lol
you mean a way of telling whether there is one? there are no subgroups of A5 of order 15 is what i meant
i understood that but i am not sure why, i think it has to do with how permutations commute with only those of disjoint cycles
then we can't have two permutations that generate a group of the order 15 if we don't have a permutation of the 3rd order that can switche with another of the 5 order
but why is them being able to switch so important
well, it's not incredibly important, except for the fact that the only group of order 15 is cyclic
for 6, there are non-cyclic groups of order 6, and we were able to find it in A5 by taking a group generated by two elements that was not isomorphic to Z/6 (notice how in my example the generating elements were, in fact, not disjoint permutations)
but for 15 we can't do that.
yes but why can't we find a permutation of order 3 and another of order 5 and then see what they generate(in A5 we can't because there necessarily exist some elements that are in the cycle of the 3rd order permutation and the 5th order one at the same time)
this means that it's because the two permutations can't switch position with one another
oh yeah you're right
now i am more confused lol
well, Z6 is not the only place to look for subgroups of order 6
in fact, there are no cyclic subgroups of order 6 in A5
that's right
so what you might do, is see if there are any other isomorphism classes (the example that i gave was isomorphic to S3)
what i understood is that the cycles being disjoint doesn't matter at all
????
check it!
well, we do get a statement that if the cycles are disjoint, like (123)(456), then the order of the group generated by the two is gonna be the product. but if they're not disjoint, then you can't say that much about the order of the group generated by the cycles
i see ...
i still don't get how your example works out
no wait i see
same cardinal
but then why can't we do the same to 15
because the only group of order 15 is isomorphic to Z/5 x Z/3
oooh yeah yeah i get it now Z/15 isn't a group i
Z/15 is isomorphic to Z/5 x Z/3
it is a group but those two are the same isomorphism class
and we already know that we can't find one like that in A5 (because Z/15 is abelian!)
so now there's nothing left to check
yes
but then why does your example work ,Z/6 is abelian too
i am sorry for asking so much
yeah, and there are no subgroups that are isomorphic to Z/6. but the key thing is that Z/6 is not the only group of order 6, where in the 15 case it was the case that once we were done checking that no subgroup was isomrophic to Z/15 we were already done
don't be sorry, i enjoy talking about it
oooooh i get it now in the first case the subgroup didnn't have to be cyclic so we could consider S3 since it is also of the order 6 but this doesn't work for 15 since we don't have another group other than Z/15 to work with in the first place
yep
good luck on your studies! also check out #groups-rings-fields
Closed by @solemn geyser
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
Solve tan(2x) + 1/sin(x) = 1/tan(x) + 1/sin(5x)
i have actually tried bashing it out algebraically
i can confirm
it does not work at least not easily
there MAY be a geometric solution however i don't see how to find it
PLEASE help
oh wait that's not a trig identity
are you just looking for solutions?
$\frac{\tan(2x)}{1 - \tan^2(x)} = \frac{1}{2\tan(x)}$ and $\frac{1}{tan(x)} = \cot(x) = \frac{\cos(x)}{\sin(x)}$
tan(x) is generally not equal to cot(x)
let him cook
sure
but that's NOT equal to sinx/cosx is it?
same 😭
Quantie
YES
im so unserious but i know how to solve this i just gotta get this shit right
also do you have any specifics for x
yeyeye
DID U SOLVE IT
pi/6 and pi/3
OMGGGGGG
trig is always messy to write, so thats the solutions then
makes sense
i dont need the solutions i cld get them from wolfram alpha i need the working :(((
not allowed to just give the solution so we will get there together
you have this
oh yh ok
what replace the 1/tanx on the RHS with tan2x/2-2tan squared x?
yeesh ka peesh what now
rewrite 1/tanx to cotx and bring them to the left and right side
@placid flume do you follow this
Not immediately no but instinct is to use multi angle formulae?
That feels wrong however
Could maybe work with more work, but i used the reciprocal
??
sin5x - sinx) / (sin5x * sinx
oh yh ofc
just combining the fractions
i gotchu
ahh u can cancel sinx from both sides as long as it isn't equal to 0
checking that gives the pi/2 solutions
After simplifying sinx - sin5x you can do that
how do u do that????
The sines identity
oh yh i've seen that
so in this case alpha is x and beta is -5x
and then i can re cancel ANOTHER cos 3x of both sides as long as i check when it is eqaul to 0
Yeah
Wait with the cancels until youve completely simplified
wait so currently the RHS is 2sin(-2x)cos(-3x) all over sin(5x)
that simplifies to -2sin(2x)cos(3x) all over sin(5x)
and then i divide the cos(3x)?
Yeahh 🦅
But over sinxsin5x
wait didn't the sinx get cancelled out earlier?
Wait for that
Now for the million dollar question
Can you simplify RHS more
hold up lemme just quickly rewrite everything without cancelling sinx yet
wait is that a double minus on the RHS for urs??
no
wait the numerator of it is -2cos(3x)sin(2x) right???
i dont see the simplification
what can you do with sin2x
yeah
wait no 4
but wait for the cos3x
so we have -4cosx*cos3x all over sin5x
yeah!
and LHS is simplified
now multiply both with -1 to get rid of the annoying -
keep it
cos so far we have cos3x/cos2xsinx = 4cosxcos3x all over sin5x
and we're not removing the cos 3x?
wait imma actually check
maybe i couldve all this time, not that itd matter much anyways
ok you cann
sorry
as long as cosx =! 0 🗿 👍
yyh yh check those values
yep
@little marlin
with sin(5x) = 4cosx*cos(2x)*sinx
there's still the cosx term so i dont think i can fully turn it into a sin polynomial
i can turn cos2x into 1-2sin squared x
sin(5x)=2cos(2x)(2cosxsinx)
yeahh
so we're looking for values when sin(4x) = sin(5x)
you go back to -2cos3xsin2x
YEAH
hahaha
alright final steps now?
love hate relationship with trigonometry
real 😭
sin5x - sin4x = 0
recognise that?
OMG IT'S THE ANGLE IDENTITY THING FROM BEFORE
yessir
okok
now just solve for each case
YH SIN(X/2) = 0 AND COS(9X/2) = 0
DAMN
that wasnt that hard was it
ur acc insane
Quantie
Closed by @placid flume
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
Hello! Can someone help me understand primes (no not prime numbers, but f'(X) and rate of change kind of prime numbers)? I know the answer to both of these questions is 14, but I have no idea why or how we got there.
Derivative?
f'(x) means the derivative of f(x), so you first need to take the derivative
Sorry if this is a dumb question, but what is a derivative?
Kind of like the differentiated form of an expresion
I think it is first to derive and then replace the value
yep
Do you know what rate of change means
I know rate of change is the slope between two points
Now the equation is in slope intercept form
To ask for mathematics help on this server, please open your own help channel or help thread. See #❓how-to-get-help for instructions.
?
Do you know what the slope is?
so the slope would be 14... is that what a derivative is? I guess I'm still a little confused on what a derivative is. I know you said it is the differentiated form of an equation, but I'm not really sure what that is either :/
No
btw I really appreciate you guys helping me with this, I've been stumped for like an hour trying to figure it out by re-reading my class notes
the equation is F(x) = 14x-16, so 14 would be the slope.
Yup
So the derivative of a function is just the slope?
Yes
Derivatives are in calc 1 or something
Closed by @astral void
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
this gype of graph is ocnsidered an even graph right?
it's a graph of an even function
yeah but why is it an even function
how would I decipher that if I was given nothing
I understand I can split it up into e^(1+x)(1-x)
but how would that give me anything
given the graph, you can see it's symmetric about the y-axis
given the function definition, you can find that f(-x) = f(x)
so would I sub in -x to confirm
oh wait
I see what you mean
so f(-x)=f(x) means even function
then does -f(x)=f(x) mean odd function?
odd function means f(-x) = -f(x)
Closed by @green osprey
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
Graph the following system of linear inequalities.
−6x + 3y ≤ −33
x − y ≥ 5
x ≥ 0
y ≤ 0
I was given this problem, I know it's unbounded but I can't figure out what area to shade, I'm thinking the whole thing will be since one linear inequalities is less than, and the other is greater than. Also since the bottom two linear inequalities are false do I not graph them?
Closed by @wispy matrix
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
is this the right integral?
I'm not sure if I need the 9.8. pretty sure I do but taking 9.8(40,000) outside as a constant seems like a really big number
@alpine sable Has your question been resolved?
<@&286206848099549185>
Hey im trying to get some help with finding the domain on z(x)=sqrt (x/x-1). i got an answer of 0,1 U 1,infinty but im confused on what to do with the brackets rather they are open or closed brackets
@everyone im new
@alpine sable Has your question been resolved?
can someone help me with a finance problem
When you reach retirement age, you would like to have enough money saved to be able to “pay yourself” an annual salary of $62,000 per year for 20 years. To put this another way, your plan is to start your retirement with a large amount of money saved, and you will withdraw $62,000 from these savings once a year for the next 20 years until all of your savings are depleted.
In the meantime, you are a 25-year-old new UIC graduate, and you plan on working for 40 years until you retire. To fund your retirement goals, you plan on investing some money in the stock market. More specifically, at the end of each year until you retire, you are going to put part of your paycheck into the stock market; you'll put in the same dollar amount every year for the next 40 years.
You are a pretty decent stock investor, and you think you can make a 12% return on the market each year you invest, both until you retire and after retirement.
What is the annuity payment (to the nearest dollar) you need to put into the stock market every year for the next 40 years to fully fund your retirement?
Write your answer, without a dollar sign in front, rounded to the nearest whole dollar. (If you do this correctly, it might be a smaller number than you'd think!)
Closed by @eternal wave
Use .reopen if this was a mistake.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
Channel closed due to the original message being deleted.
If you did not intend to do this, please open a new help channel,
as this action is irreversible, and this channel may abruptly lock.
Send your question here to claim the channel.
Remember:
• Ask your math question in a clear, concise manner.
• Show your work, and if possible, explain where you are stuck.
• After 15 minutes, feel free to ping <@&286206848099549185>.
• Type the command .close to free the channel when you're done.
• Be polite and have a nice day!
Read #❓how-to-get-help for further information on how to ask a good question, and about conduct in the question channels.
hey
i have a question for a math problem
What is it
what is your question
i need to find the distance to all the points
So do you know how to do this and need help or have never done this before
well i know how to do it but im stuck with a to D
because D had (x,8)
@green shoal
please get someone else I've got something that came up sorry 
I would recommend setting variables to the coordinates of C and finding how each point connects
For example, C is (x+12,0)
(12x,0)?
The y value is 0 because it is on the x axis
my math is in french
ohh
The x value is the same distance from D as A is from B
The x value of A+12 is the x value of B
14-2
but why
That is how far apart B is from A considering the x value
The distance formula is
\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}
mari
Compile Error! Click the
reaction for more information.
(You may edit your message to recompile.)
alright ill write that
You know that the distance from A to B is the same as D to C
yes i know
(Since it is a rectangle)
but how is D the same distance from B as A
\begin{align}
\sqrt{(x-2)^2+(8-2)^2}\\
\sqrt{x^2-4x+4+36}\\
\sqrt{x^2-4x+4+36} = \sqrt{(a-14)^2+(0+6)^2}\\
\sqrt{x^2-4x+4+36} = \sqrt{a^2-28a+14^2+36}
\end{align}
14.42?
yes
What is it in exact form
Without the decimal
14
So $\sqrt{208}$?
mari
yes
but can u make sure that it was the right thing that i did
In a bit
alright
mari
alright
To find the distance from A to D, you have to find the x coordinate for D. You know that the distance formula from A to D is equal to the distance formula from B to C. Instead of putting x in the distance formula, put it in as 2+a for the A to D one and put it as 14+a for the B to C one
Ill check your work for the other while you set that up
wait what do u mean by 2+a and 14+a
\begin{align}
\sqrt{(14-2)^2+(-6-2)^2}\\
\sqrt{144+64}\\
\sqrt{208}
\end{align}
mari
For the unknown points
Instead of putting just the variable x, put 2+a for the first one
And 14+a for the second one
oh alright
\begin{align}
\sqrt{((2+a)-2)^2+(8-2)^2}\\
\sqrt{a^2+36}\\
\end{align}
mari
Like that, but do 14+a for the next one
so (2+a - 2)^2 + (8-2)^2
\begin{align}
\sqrt{(x-14)^2+(0+6)^2}\\
\sqrt{x^2-28x+14^2+36}\\
\sqrt{x^2-28x+160}\\
\sqrt{x^2-28x+160} = \sqrt{a^2+36}\\
x^2-28x+160 = a^2+36\\
x^2-28x+124 = a^2
\end{align}
Actually keep the a for one and put an x in for the other
So we can find what one of them equals
mari
This is harder than I thought it would be
wait i have an idea
we could find the slope for A to B
and use it to find like the distance
D to C maybe
By replacing
You already know what D to C is
14,42x right
But yes we should find the slope of the line connecting A and B and find a slope perpendicular to it
Just use sqrt(208)
alright
but why
To not have to intermediately round, its a good habit, exact answer, easily manipulatable
alright got u
\begin{align}
\frac{-6-2}{14-2}\\
\frac{-8}{12}\\
-\frac{2}{3}
\end{align}
mari
That's the slope from A to B
wait i did a mistake, 14,42 is the distance between A to B , thats not the slope sorry
oh alright thanks
so -2/3
Now we need to find the slope perpendicular to that
so 3/2?
so its A to D and B to C
x is 6
oh but how did u find that
D is (6,8)
This
But twice
C is (18,0)
sorry to ask why so many times but why lol
Now find the last distance
Because that is how slope works, it is a change in y over a change in x. I am moving up 3 units and moving right 2 units for each interval. Since the y value for D is 6 more than the y value for A, I have to do this slope progression twice
ah so if D'S y is higher value than A u do it twice?
No
If I do the progression once, I will find the midpoint between the two
How about this, try the progression once and tell me what point you get
alright wil ldo once i find the distance between D and C
i found 208 again
the square root of 208
It's not 208
what is it
I haven't done it but show your work here
You found the distance from D to C
We already knew it was sqrt(208)
Find the distance from A to D
Which will equal the distance from B to C
That sounds right
alright so now i have to do it times two
Do what times two
What?
The area is sqrt(208)xsqrt(52)


