#help-17
1 messages · Page 214 of 1
since this is degrees, we need to add 360 but yeah
I mean add 360 degrees
we can convert to rad after
Yeah so 311.4096
ok, so what quadrant is that in?
4th
alright, and what other quadrant has negative sine?
First
remember that sine represents the y-value on the unit circle
where else is the y-value of the unit circle negative?
3rd quadrant
yes
so, let’s think about what angle in the third quadrant would give us the same result
I would say reflect it over the years axis
Subtract 180 which is 131.4096
but don’t forget that the third quadrant starts at 180
Oh right
so you’ll need to add another 180
So I’m back at 311.4096
you need to subtract the negative angle from before from 180
should be 180-(-48.59)
So 311.4096 and 228.59?
yep
Thank you so much, the teacher picked some quiet kid to example the problem and I couldn’t hear them
lmao poor kid
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multiply top and bottom by sec^2, then rewrite the bottom sec^2 as 1 + tan^2, then let u = tanx
But what about the pi/2 how do I integrate
The pi/2 is out of domain of tan
How do I do it
limit of tanx as x approaches pi/2 from below is infinity
when you make the u sub, the lower bound becomes tan(0) = 0 and the upper bound becomes tan(pi/2) = infinty
Since when substituting tanx as u I'll have to change the limits right?
yes
Oh right
the integral is over the interval 0 < x < pi/2
so you want lim as x approaches pi/2 of tan(x)
So I just write infinity and it becomes improper integra?
Ok bro I'll do wait
limit is infinity
,rotate
Is this correct?
yes
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im always getting 10/3ft/s
and its not the right answerr
$\frac{15}{6}=\frac{x+y}{y}$
vinch
where y is the length of the shadow of the dude
and x is the distance from the pole to the dude
kinda looks like this
$\frac{dx}{dt}=5$
vinch
and im finding $\frac{dy}{dt}$
vinch
that's all the information i can give
you also forgot that x at this moment in time is 40
yup
this equation could be written simpler as (x+y)/15 = y/6 instead, try using that variant then redoing the work
and that kinda throws the wrench
alrightt
@surreal basin i'm getting $6x+6y=15y$
vinch
the problem is if x=40, i cant really do that
if I implicitly differentiatie this, $6\frac{dx}{dt}+6\frac{dy}{dt}=15\frac{dy}{dt}$
vinch
now i know what dx/dt is
also youre finding d(x+y)/dt not dy/dt
ohh
also you should consider subtracting 6y from both sides
bit of improvement overall
...
dx/dt + dy/dt
you still find dy/dt
then you
actually as a question, if you knew dx/dt and dy/dt, how would you find d(x+y)/dt
you find dx/dt
and you find dy/dt
then you add them together
that didnt seem to click when I said dx/dt + dy/dt the first time
what did you think I was doing
uhm idk?
so your just adding the rates of x and y
that makes sense
i actually got the correct answer now
but is it a general property?
np
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I'm not sure what to do to solve this expression
That is basically arcsine(1/root2)
So assume some x = arcsine(1/root2)
So then sinx is 1/root2
U can solve it from there ig
@vast shale
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Is my graph on the second screenshot correct for the task in the first screenshot?
How is (a-b)² = a²-2ab+b²?
wait did I open in the wrong chat?
Unless the question you asked has some sort of deep-ish maybe relation to what they asked
yes, seems all good to me, nice
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Help me with dimensional analysis please. I have trouble on the second question. Please check the answer to my first question also. This is for my general physics class.
first one is correct
And second pls?
I'm having trouble because the given is grams per cubic CENTIMETER while the other is kilograms per cubic METER
That is no problem since you can look at both units seperately
I'm still confused 😕
You know that 1g = 0.001kg. For the volume you know that 1cm = 0.01m, so a factor of 10^-2
now if you want to convert cm^3 to m^3, you also need a factor (10^-2)^3
exactly, your factor is 0.001/10^-6
You can use this to multiply with your original value of 11.3 to get your final answer
Hmm ok I'll try that
@regal otter Has your question been resolved?
Uh I can understand but I still have difficulty with the dimensional analysis
Do I first convert 11.3g/cm^3 to g/m^3?
Then it would be like this..?
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✅
you have a tendency to convert by multiplying by fractions haha
sometimes its simple but sometimes its tricky
consider converting by substituting!
like...
Because my teacher taught us to use dimensional analysis, I might get deduction
Yeah I know... but how do I make it like the dimensional analysis
Because even if the answer is the same, the method isn't
i understand :d
So can you help me please? 
I can't wrap my head around it
its easy, dont think too much about it
all you need is these 2
which you know
1 kg = 10^3 g
1 m3 = 10^6 cm3
let me show you how to proceed
$\rho = 11.3 , g/cm^3 = 11.3 \cross \frac{1 , g}{1 , cm^3} \cross \frac{1 , kg}{10^3 , g} \cross \frac{10^6 , cm^3}{1 , m^3}$
you see how i did it?
the same way you did for the first question
1st fraction to convert g to kg, and 2nd to convert cm3 to m3, obviously..
Emily
Isn't the second one supposed to be 1 kg=10^3g?
yes yes, my bad
Then denominator would be 1000m^3?
why
$\rho = 11.3 , g/cm^3 = 11.3 \cross \frac{1 , g}{1 , cm^3} \cross \frac{10^{-3} , kg}{1 , g} \cross \frac{1 , cm^3}{10^{-6} , m^3}$
because its 10^3?
theres this way too
$\rho = 11.3 , g/cm^3 = 11.3 \cross \frac{1 , g}{1 , cm^3} \cross \frac{10^{-3} , kg}{1 , g} \cross \frac{1 , cm^3}{10^{-6} , m^3}$
Emily
Ah alright. So the final answer is 0.0113kg/(10^-6) m^3 ?
after crossing out 1 g with 1g and 1 cm3 with 1 cm3, you're left with
$\rho = 11.3 \cross \frac{10^{-3} , kg}{10^{-6} , m^3}$
Emily
what about 10^(-6) !!!
It's 0.00001?
you want to simplify before plugging into your calculator, or not?
cuz you can just do 11.3 * 10^(-3) / 10^(-6)
idk why you didnt divide by 10^(-6) here!
$\rho = 11.3 \cross \frac{10^{-3} , kg}{10^{-6} , m^3}= \frac{11.3 \cross 10^{-3}}{10^{-6}} ,, kg/m^3$
Emily
you can punch that into the calc right away
I get it now. Sorry. Thank you so much for helping me.
yw!
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um super embarassing but can anyone help
we meet again
oh hey its you
lol
finished my long assignment now its just my easier quiz
im not sure how i got everything wrong twice but yeah
im assuming i made a mistake from the start with the series
aight lemme see
i can see you used the expansion directly which we studied earlier
but
yeah arctan
i assume i did the arctan 5x series right
i guess i just messed up with multiplying the 1/x
yeah seems like that
expansion seems correct
Your integration step is wrong
You forgot the (2n+1) that was already there in the denominator
Also didn’t understand where you got 2n+2 from
oh its you again too
i think she tried multiplying by x and dividing , but the 2n + 2 doesnt make sense
oh wait, is thedenominator supposed to be (2n+1)(2n+1) instead of what i did
Yes
ah ok
yeah thats my bad im not that good with the integral power rule
is everything else with the integrated series correct
Yes
,w series of arctan(5x)/x at x=0
thank you
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Prove that the plane of the plane angle corresponding to an even angle is perpendicular to its edge.
hi so what is that line in the middle
why did they make an angle
And how do i prove this
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Informally, all you have to do is consider how many times that loop iterates for different values of n
Say n = '7', how many times does the loop iterate
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hi
in order to solve this
my books says
i have to simplify to that
but how can i just "know" to simply to this
how am i suppose to know that
Its partial fractions
add +1 and -1 in numerator to x^2
then split that
how?
He explained well
okay yes, but how can i know to do that, it seem to randomly coming out of nowhere
it becomes an general observation while you solve multiple questions like this... me too was confused at start when I was learning but gradually you will be able to see these simplification things as you solve these type of questions
yea can do this way too
If this was x^3/(x^2+1) for example, it would have been like Ax + B + C/(x^2+1)
(Didnt check but B is probably 0 )
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wait
I guess they just divided it
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how do i do this
to find the first term you plug in n=1 into the formula
but the question for the common difference makes no sense, there is no common difference
and how I'm gonna do the fraction
you know how fractions work, right?
if you plug n=1 into the formula it looks like $1+\frac31$
Denascite
no
no
😥
how
you first compute the fraction $\frac31$ which means 3 divided by 1
Denascite
ohhh
and the second term
n=2
ohhh
so
the first term is 4
and the second term
are you still there?
yes
have you tried computing the second term?
no
?
maybe it would help to write it as n+(3/n). You are interpreting it as (n+3)/n
well you need to learn to interpret fractions correctly without having unnecessary brackets
💀
but thats not the problem here
you are unable to compute 2+3/2
you desperately need to revise fractions
our teacher told us first to find the first and second term
then subtract them to each other to find the common difference
that works for other types of sequences
the type of sequences that have a common difference
this one does not have a common difference
(those are called arithmetic sequences or arithmetic progressions)
!noans
The purpose of this server is to help you learn, not to hand out answers. Do not ask someone to give you the answer directly.
Oh
!nosols
As a helper, please do not give out answers that could be copied as a homework solution. Have the student work through the problem themselves and guide them along the way.
you know k and m, and you know a_k and a_m
so you can solve for d, which is the common difference.
5
@pulsar cliff Has your question been resolved?
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But the answer is p > -5/2??
I don’t know what’s wrong, I have tried asking ChatGPT, but it just gives me a statement like “to make sure that the expression y^2 - 2(p+4)y + p^2 - 4 < 0 well have to take the opposite”
Im like what the hell, the p value comes from us aiming for < 0, then why do we have to take it as > now??
Btw I’ve checked using Desmos and differentiation and the answer do is p > -5/2.
ive tried before, chat gpt aint the right thing to ask at all
This one too, somehow the answer is k > 2
Yeah but I don’t think I have better ones to go to
Same with my chemistry physics and math
whats that second line doing
Which question?
ah, you got rid of the fraction didnt you
I’m sorry for sending the second one here, it only distracts us🙏
thats a weird way but ok
ill help with the second one first
maybe itll help with the other one
Sure
its weird
the second line
Oh yeah
you multiplied thr denomatior over right?
this also looks like you solved for the roots and not stationary pts
This is through discriminant
Basically to set when the curve equals some constant
Just for convenience I used y
mk
To solve for roots: points of the curve intersecting with the constant
Which is the stat pnts
ok
i might be stupid
you said the discriminant of your thing is more than 0 so it has no real roots?? first q
idk seems weird
did you get the >0 and <0 mixed up or is this something that idk
In order for the original equation to have 2 sp, discriminant of x > 0; for the y express to be > 0, discriminant of y < 0; solving gives p < -2.5
I don’t see what’s wrong
If the discriminant of y < 0, y don’t have real roots
In which means that y doesn’t touch the y-axis
Yeah everything seems right to me
Can I call the helpers now?
yo ima just put this here for a sec. its not the way you want, but it might help?
@limber pasture Has your question been resolved?
<@&286206848099549185>
sup
-_-
I am askinh
What's the question
What happened to this
It was right
Jing ping me when ur online
@honest flame
This is the question and my try
The answer was correct
But the answer provided was p > -2.5
I got p < -2.5
And I’m very sure that p < -2.5 is correct
But I don’t know how to get it
Also my teacher specifically asks us to use the discriminant
Ya
Find the derivative of y with respect to x:
dy/dx = ((x - 2)(2x + p) - (x^2 + px + 1)) / (x - 2)^2
Simplify the derivative:
dy/dx = (2x^2 + px - 4x - 2p - 1) / (x - 2)^2
Set the derivative equal to zero to find the turning points:
2x^2 + px - 4x - 2p - 1 = 0
Rearrange the equation to form a quadratic equation in x we get
2x^2 + (p - 4)x + (-2p - 1) = 0
For two distinct turning points, the discriminant (b^2 - 4ac) must be positive
(p - 4)^2 - 4(2)(-2p - 1) > 0
p^2 - 8p + 16 + 16p + 8 > 0
Combining we get
p^2 + 8p + 24 > 0
Factorising:
(p + 2.5)(p + 9.6) > 0
p > -2.5 or p < -9.6
Since p < -9.6 is not a solution (as it would result in a negative number of turning points), we conclude that:
p > -2.5
Question solved
(:
Well that’s using differentiation
I am told to not use that
um like only discriminant
No differentiation and stuff?
You could use his answer then
I can explain his answer too
Got any doubts
Pure discriminant
No differentiation
Actually it’s just to practice
In exam I’ll probably still choose to use differentiation
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Not understanding how they could just add x1000 on this??
I get as a method of calculation but they never divide it by 1000 so how is it the right answer??
They multiplied and divided 1000 at the same time
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Could some please help me understand geometrical representation of differentiation?
hm, you can think of the derivative of a function at a point as the best linear approximation to the function at that point
so the line that "best fits" the curve at that point
What do mean by linear approximation?
it gives the slope of the tangent line, which is the line which is closest to the function at any given point
yeah
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write now what i’m thinking to do is
rewrite 2logx as
logx^2 - logx^1/2 = 3
it's easy
take log_2 x common and get your answer.
second term would be -1/2*logx (to the base 2)
2logx is logx²
Log(p)-logq
Is log(p/q)
a^Log_a(n)=n
All you need
!nosols
As a helper, please do not give out answers that could be copied as a homework solution. Have the student work through the problem themselves and guide them along the way.
Just see sqrt x as x^1/2
Understanding the log properties is important. Such as:
m × logn = log( n^m)
loga - logb = log(a/b) etc.
Did not know that, I'll keep that in mind
We appreciate your zealousness, but don’t give them the solution
log n^fm
so m^log n = log n^(1*m)?
Yeah
@cinder frost Has your question been resolved?
yes @vocal sleet
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how many 3 digit numbers are there that have 16 divisors
What have you done so far
nothing...
I don't know how to solve it
well actually, i do know how to find how many factors a number has
Alright, usually when we count the number of divisors a number has, we consider it’s prime factorization
however, I just don't know an easier way to do it
because there are many numbers that have 16 divisors like
2^3x3^3
but there are a lot of options
to get these
Yeah, you pretty much need to consider all of those possibilities
But there must be an easier way
I don’t think there is, and there aren’t that many possibilities
First, find the number of ways you can write the prime factorization in terms of arbitrary primes p_1, p_2, …
so, lets consider the posibility of the exponents being 3, 1, and 1
there can be a lot
of options for p1 p2 and p3
Yes, but you can find the largest
also Ive just went through all the p1 p2 p3 p4 cases
as long as you use a calculator youc an go through them quickly
can you give me how many cases?
that doesnt mean Im doing them for you you know
ok...
you need to practice pushing buttons that have digits on them cmon
so did you get 46, 47, 48, 49, or 50
why are you guessing
because that seems like a lot of cases to go through
but the answer choices are 46-50
remember, these are 3-digit numbers
the p1 p2 p3, and p4 cases
@thin vale
that implies p1, p2, p3, and p4 arent the same prime doesnt it
yes
did it occur to you that 16 can be factored into other primes
if you group them up (2 * 2) * 2 * 2, then thats 3 1 1 as you said earlier
so thats p1^3 p2 p3 that you then also need to search
in addition to p1^3 p2^3 which you also need to search
youre not done yet
then you gotta go through them
and that will take a long time just guess and checking
I just did the p1p2p3p4 cases with a calculator
do you need me to tell you how to guess and check quickly?
you dont need a Special calculator to multiply numbers together
you keep in mind the first few primes are 2, 3, 5, ... 31
then you go through them starting with 2 3 5 7
when one goes too big, you skip one
you should eventually end at 2 5 7 13
this will account for less than 20 of the cases
the others should mostly be the same
not really, what idea do you have
no i just mean do you know the concept
not the explicit formula but the concept should be enough
like if i have 7 indistinguishable balls and i want to give them to 3 distinguishable people
how many outcomes are there?
do you know the concept
?
I asked you what idea do you have
easy, you just do 6 choose 2
you can state the idea and we can see if stars and bars works for this problem
I said yes
ok
ok
hold on, i'm looking through lecture notes
@surreal basin I don't see anything in my teacher's lecture notes that could help
i think i'm going to guess...
youre not guessing
let me try to do it your way
now keep in mind that way works for p1p2p3p4
why do you keep saying obvious things
idk
also shouldnt that be p1^3 p2 p3 and p1^3 p2^3?
no, i already know the exponents
so yes to that
Ok, well I also have another question
yea
Find the largest two-digit positive integer n such that (n\choose3)(n\choose4) is a perfect square
please excuse the latex, it's just to make it easier to read
nw
so, have you found a method?
have you tried writing that out as a polynomial then factoring out the squared terms?
you don't need to do that...
i don't think
because dr. gao would probably not ask for a polynomial
it probably would be like figuring out what n choose 3 would look like and n choose 4
then multiplying to get
{(n(n-1)(n-2))^2 (n-3)}/144
thats literally what I just said
bruh
you need to try things before you say them
yep
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hello, i need help with these please
i really dont know whats wrong
see,
For partial fraction decomposition to work correctly, the degree of denominator must be strictly greater than the degree of the numerator
what do we do if its not
we will try to make lesser degree polynomial in numerator by algebric manipulation
you got it or it's still not clear?
not really, how do we exatcly make it less
lemme explain
for example take part b
$\frac{x^2}{x^{2}+x+72}=\frac{x^{2}+x+72-(x+72)}{{x^{2}+x+72}$
what's up with it
$\frac{x^{2}}{x^{2}+x+72}=\frac{x^{2}+x+72-(x+72)}{x^{2}+x+72}$
Samuel
why it didn't work for me?
You are missing a closing }
where did we get the new bracket from
what we are trying to do is to reduce the degree of numerator
it can be achieved by making some cancellation on both numerator and denominator
so we'd need 4 terms now
from here what you need to do is to separate the fractions
that will lead to some cancellation
itll go back to the original function no?
yeah cause we just added the x+72 and then subtracted it
so overall we just added 0 to it
how does that make the numerator less tho
you have to separate those fractions for it
so it will be
$\frac{x^{2}+x+72}{x^{2}+x+72}-\frac{(x+72)}{x^{2}+x+72}$
77²
got it?
so now we divide x^2+x+72 by x+72
huh no
x+72 is in numerator
we are dividing it by that quadratic expression
how would that go
you got upto that?
ye
so what do you get after simplifying it?
yeah but missing something
im bad at maths
1-this
where does that same form
yup
ok so now we have 1-(x+72)/x^2+x+72
so now since the degree of numerator is less than the degree of denominator, you can use partial fraction decomposition here
can u help out with that
bro for partial fraction decomposition you have to factorise the denominator
maybe try analyzing the given example
you sure about that factorisation?
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According to the graph, AB = R√2 and mBD = 53 degrees. Calculate the slope of AB
Join b with the center so the angle made will be 53degrees and so thr x and y coordinates can be found
Join a with center as ab is r√2 and oa and ob are r angle aob will be 90de gress and so angle aod will be 90+53 and so coordinates of a can be found then use distance formula to find eq and then slope
Rsinx Rcosx
Then you need to learn polar coordinate system
those are the coordinates
For a unit circle y = sinx and x = cosx
Then learn it lol
That's what I am doing
where do I use thag
if I replace that in the equation y = 4/3 x the R gets canceled out
perhaps with the distance formula
and AB
?
mm no
<@&286206848099549185>
I have
B: y = 4/3 x
A: y = -3/4 x
Yess find the coordinates of b and a in terms of r then use the distance formula
To formulate an eq of line
Y= mx + x where the coeff of x is going to give you slope
A (4/5 R; -3/5 R)
B (3/5 R; 4/5 R)
And then use distance formula
I'd say first apply distance formula and then write r in terms of x to find the coedd
Yess
distance formula for what points
AB?
A and B
How should I name the variables
Yes cause we want the eq of line ab
What variables?
of the coordiantes
Let variables of a be x1 and y1 and b be x2 and y2
Dosent really matter tho
(x1 - x2)^2 + (y2 - y1)^2 = 2R^2
The ans?
?
Is this the ans you're getting ?
for the problem obs no
No is this the distance your getting 2r²
yes
(x1 - x2)^2 + (y2 - y1)^2 = R^2 2
is the same
if u want
it like that
idk
perhaps you confused
2r^2 with (2r)^2
idk
what should I do next
I am not getting the plan
like I am visualizing a system maybe
but don't know with which variables
Wait I fcked up give me some min
oh ok, don't worry
Tan 8 degrees
I extended the line to meet the x axis so we have y / x = tan x which will give us slope
Ohh wow, right, that's smart
so 1/7
thankss
Wlc
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can someone please help me understand this
I dont really understand the notation they used to describe L
or how they came up with it
@candid ledge Has your question been resolved?
@candid ledge Has your question been resolved?
Okay this isn’t my field, but it looks like the center circle denotes accept states, starting at the left side. Since the empty word (?) is allowed n=0 is permitted. Then on the right following the arrows, ø->a->b gives ab which is acceptable, otherwise continue to ->a->b which is acceptable… therefore any number of ab combinations is permitted. Therefore (ab)^n where n is an element of the integers greater than or equal to zero builds the language
It’s in set-builder notation
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Would someone mind helping me step by step through this
well for the add on loan, your total interest is given by your principal multiplied by your annual interest rate multiplied by the number of years
6700 * 0.05 * 3 is where the 1005 interest comes from for that loan
then your total payment with the dealer would be the 300 down payment plus the 6700 you borrow plus the 1005 interest on that
add those up, divide by 36 since you make a payment every month for 3 years, and that's your monthly payment with the dealer
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sorry for not responding
@next burrow Has your question been resolved?
@next burrow Has your question been resolved?
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hello im doing a question on partial fractions and i dont know the decomposition for cubic polynomials....
you know about synthetic division?
polynomial division
?
long division?
yeah if that's what they call there
am i supposed to do long division first ?
see there is a condition for partial fraction decomposition to work
okay ill try
the degree of numerator has to be strictly less than the degree of the denominator
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Find the focus, vertex, axis and directrix equations of the following parabola.
where did the +9 come from
In the first three lines
they added it intentionally to form a perfect square in left hand side
see if you have $x^{2}+2{\cdot}a{\cdot}x$
77²
77²
i have no idea what you just said
I just said that you have to try to form a perfect square
it is not always a definite procedure
you've to think about it calmly and understand it
yknow what ill just skip this question
im sure they wont give us hard stuff like this in the test
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that's not hard😭
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Hi, I had a question about formulating statements and one of which was say “If a series converges, we know that the sequence {an} as n->inf is 0 or the nth term is 0” and from contrapositive “If the nth term is not 0, the series does not converge; it diverges” I also know it is not proper to say “If the nth term is 0, the series converges” as we know the statement is true only with the condition that when the series converges the nth term is 0.
So my question was is there an example of when the nth term is 0 but the series diverges? Thanks.
when you say "the nth term is 0" do you mean "the limit of {a_n} as n approaches infinity is 0"
yes I just edited
answer is yes. for example, consider the p-series 1/n^p where p isn't greater than 1
as p approaches 0?
sorry last question
when p<1, doesnt the sequence {a_n} as n->inf approach infinite and not 0
indeed 🔥
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If sin10°=k, sin280°=?
Sin(270+10)
Ik that
So
And that turns into -cos10
Make a right angle triangle with hypotnouse 1 and perpendicular k and find it's base
And the answer is -sqrt(1²-k²)
Yea
What
Do u know
U can also use that
sin^2x+cos^2x=1
Oh wait
Im dumb
Ty
I didnt notice that
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Nvm
Fair enough
Wait... Is this sin and cos channel?
Trigonometry?
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erm
what you are supposed to do here?
Yea ig
prime factor tree is correct way?
there is image linked in message
how do i find root of 229.7
Bro strike off square and root
you get same value tf
can u use more mathematical term than strike off idk what that means
(Sqrtx)^2 = x
((229.7)^1/2)^2
Square root is written as
can you prove that
ok i know what to do but i need proof
Proof of problem or proving the strike off thing?
