#help-0
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2.69 rad means "2.69 radians"
i thought it looks like something like 3pi/4 or something
How many degrees is 3.1416 radians about
I searched in google. is it 180 deg?
180/pi
Yes
Wait am i just gonna multiply the 2.69 to 180/pi?
And they just want you to use 3.1416 for pi so what's the rate for this specific problem
Also yeah
180/3.1416 ?
Yeah
Ohhh I get it now. Thanks!!
Epic
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How would I even start this substitution? I cannot factor the ellipse equation and I cannot write x,y in terms of s,t
x^2+2xy+2y^2 almost looks like a perfect square
Compute s^2 and you'll see it immediately
That sounds right
It is
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I hope that they didn't say the area was pi
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okay so
you understand why the first line is what it is
and now you understand what P = xy means
right?
instead of f(x) ur teacher just used P (i assume it means product)
what is that u need in the q ??
yes i understand that much
alright so
in the first line she manipulated the equation to get x in terms of y
so she had
im just needing a walkthrough so i better understand
$x + y = 30 \implies x = 30 - y$
okay cool
by subtracting x from both sides
so then we wanted to maximize the product of the two numbers
whcih was
$P = xy$
not discordmod
not discordmod
oh k
$P = (30-y) \cdot y$
not discordmod
not discordmod
so now we know that there will be a critical point where the derivative equals 0
(in this case, because it is an upside down quadratic, the point we find will be the max)
,w plot 30x - x^2
we would be finding that max point
so we take the derivative of bot hsides
$\frac{d}{dy} P = \frac{d}{dy} 30y - y^2$
not discordmod
not discordmod
we know that it will have a critical point where the derivative is 0
so
$0 = 30 - 2y$
not discordmod
$2y = 30$
not discordmod
$y = 15$
didnt someone JUST ask about this x + y = 30, max(xy) = ?
not discordmod
same guy he wanted a walkthrough
o
sorry
so yoyo
okay awesome
do you understand how i got to y = 15?
yes
okay cool
so we know that it will be a max if
$f''(x) < 0$
or if the sign of the derivative changes around the number we found
so in this case
we can do
in the opposite case would a min be at f"(x)>0
yers
thats epic okay
but the second derivaitve tests fails sometimes so we have to check the sign around f'(x)
max is f''(x) < 0
not discordmod
so it would be the opposite of this
not discordmod
not discordmod
so in this case the second derivative is always negative
meaning that for y = 15, (the point we found) the second derivative is negative
which means the point we found was a max
if it were to equal zero would i just need to test around the critical point
test pts
yep exactly
great!! thank you so much that was very helpful
absolutely!
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What happens when a log is an exponent?
Well, $a^{\log_{a}b} = b$.
Len
It's not too important here though
for this
it is the same as
$\frac{e^{\ln(3) \cdot \log_{2}(4 \sqrt{5})}{e^{\ln(3) \cdot \log_{2}(\sqrt{5})}$
not discordmod
$\frac{e^{\ln(3) \cdot \log_{2}(4 \sqrt{5})}{e^{\ln(3) \cdot \log_{2}(\sqrt{5})}$
```Compilation error:```! File ended while scanning use of \frac .
<inserted text>
\par
<*> 328662734008745984.tex
I suspect you have forgotten a `}', causing me
to read past where you wanted me to stop.
I'll try to recover; but if the error is serious,
you'd better type `E' or `X' now and fix your file.```
xd
im struggling
oh
I see what you did tho
anyways
so this is
$3^{\log_2(4 \cdot \sqrt{5}) - \log_2(\sqrt{5})}$
not discordmod
which then you can apply log rules
(subtracting two logs is log of a quotient)
so
$3^{\log_2(\frac{4\cdot \sqrt{5}}{\sqrt{5}})}$
not discordmod
not discordmod
which is just 9.
I’m confused about the 3log2
which step
Once you combine everything after you turned it into a subtraction
$\log(x) - \log(y) = \log(\frac{x}{y})$
not discordmod
this?
Yeah
this is kinda just a rule
because you know how if you subtract powers of exponents, then you are dividing
and because log() is the inverse of exponents its rules get flipped
Oh wait I think I know why I’m confused, I think you wrote the step wrong there should be a three there right?
not discordmod
this is a rule for exponets
So the only thing you’re doing is dividing the exponents
yes
And you don’t included the second 3 because they’re the same base??
yes
the only way you would include the second 3 if it was something like
$\frac{3^4}{27^3}$
not discordmod
not discordmod
because 27 is 3^3
Ok I think I get it, I might get some extra help from my teacher but I get the basic idea thank you
you're welcome! is it okay to close this channel?
@gilded vale Has your question been resolved?
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I got b but apparently the answer is c?
How?
nvm found my mistake have a good day
when I was trying to find the velocity I multiplied by radius instead of circumference
ok close it
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Can someone write out and show me these 2 plz?
Just used a calculator lmao
@misty dagger ??
Aren't you trying to graph it?
-3 to 5 within x range
Used calculator in y-graph. Just type -2abslxl
From -3 to 5 range
boom
If your not allowed to used calculator on it, then i can tell you after
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@misty dagger I can use a calculator
I just don’t understand what u mean
Yeah I know how to do that
Im@looking more for the evaluation
Do u know how to do?
Yea
Oh shoot
That give you answer
Oh well
Got any questions? I am about to go to bed.
You can evaluate without a calculator, but I don't have times to do that since it's pretty late.
But you can check your answers with calculator
@alpine sable Has your question been resolved?
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How do you do question 21b
i've done 21a
but i don't see how i can sub tan(a) and tan(b) into these equation
s
@hazy stirrup Has your question been resolved?
sub/eliminate y
What
where di the 1/2y come from
2nd line
what
still dont get why its x = 1/2 y
wdym
its ok if u don't get it
i'll just wait for the next class
no
doesn't say
ok
.close
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A line goes through points P (0, 2) and Q (a, 0) is parallel to the line y = 2x + 1. Determine the number a.
what have you done by now? where did you get stuck? have you drawn a picture
$2=\frac{0-2}{a-0}$
Theophania
yes. than solve for a
Theophania
a = -1
Is the triangle right-angled, if the corners have the coordinates:
a) (-2, 3), (1, -5) and (6, 6)
b) (0, 0), (7, 4) and (2, 11)?
Motivate your answer.
How can you tell?
find the angles of the sides of the triangle and see if they form a right angle
a picture would help
great
$$\left(-2,3\right) = A$$
$$\left(6,6\right) = B$$
$$\left(1,-5\right) = C$$
$$m_{AB}=\frac{3-6}{-2-6}=\frac{-3}{-8}$$
Theophania
good
exactly
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R on the set {1, 2, 3, 4, 5} defined by the rule (x, y) ∈ R if 3 divides x − y
Element of R = {(1,1),(1,4),(4,1),(2,2),(2,5),(3,3),(4,4),(5,2),(5,5)}
I just want to check with my answer. Am I correct ? Tq.
@clear pivot Has your question been resolved?
Yes
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help
i dont need help with any of thhe questions themselves
i just need help understanding the equation
and the example
i got answers from tons of people ik but i dont feel comfortable turning in the work without actually learning it
been stuck on this for weeks and its due tmr 😭
can someone explain step by step the example
i rlly dont get it
i tried to follow pendas but it turns out wrong
You need help understanding where the formula comes from or the calculation itself?
calculation
i been on this for weeks
its due tmr
i love procrastinating
I don't think calculation for this is that easy by hand
i have a calculator 😭
if i stick with PEMDAS i get this
i can't go any further bc the numbers would be too small
can you spot a mistake in the steps i made so far
OH MY GOD
LORD
lmaoooo
small mistake
thhank you so much
.close
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help
i was writing this before it was occupied
a6-7b=?
Im really so so sorry
No no sorry i didnt know anything about this server im just new
can someone help me? im stuck here and i still dont know how to solve this or answer its hard for me :)
yeah i can
:0
you know the equation for a line, right?
Yup
but its kinda confusing me
since my teacher doesnt teach us he just send a video
oh yes
yup
so i'm pretty sure you can just check of the first 2 columns now
next up for the y-intercepts
oh wait i get it now
uh
do you understand the y-intercepts yet?
well my teacher send a video of that so i do get it i will just re watch it :D
uh yeah
feel free to dm me if you have any additional questions
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YY
A and B are event, P(A)=3/8, P(B)=3/4, P(A∪B)=7/8
the question asks for P(A' |B)
i got 3/4 - 1/4 =2/4 as the answer
that's what i had in my mind
P(A' | B)
= P(A' ∩ B) / P(B)
= [P(B) - P(A ∩ B)] / P(B)
So your Venn Diagram work is good, but don't forget that a division comes with the notation
what you mean "don't forget that a division comes with the notation"
its P(B)-P(A∩B) right
oh i have to divide it by P(B)
P(A' |B) is when event B happens but i don't want the part when event B and event A both happens at the same time, right
and in venn diagram it gonna looks like this, so here we got P(B)-P(A∩B)
you calculated P(A' & B) rather than P(A' | B)
symbol ∪ and symbol & having the same meaning in math, right
thank you
got it thank you
What is &? Never seen it used
i think it mean "and" in english
Okay I guess, but you should jsut use ∩
also: it means*
ok get back to the question, i know the Conditional probability
formula is P(B|A)=P(A ∩ B)/P(A)
thank you
Yes, and you want to find P(A'|B) right
in my understanding the formula means we want the probability when event A happens but i don't want the part when event A and event B both happens at the same time.
am i right
No that's the wrong understanding
ohh
P(B|A) means something like this: What is the probability of B if we know A happened?
can i have some example
Sure
Let me think of one
Okay, lets say you have a dice
A - we got an even number
B- we got a four
then P(B|A) is when we got an even number and the number is four?
Probability that we got four under the assumption we got an even number, is : P(B|A)=P(AnB)/P(A) = (1/6))/(1/2)=1/3
And this answer makes sense
Because if you KNOW you got an even number, then the chance of getting a 4 is 1/3 because there are only 3 even numbers
no i dont, i haven't learn about that yet
So how do you define P(A)?
P(A)=n(A)/n(S)
and what is n(S) and n(A)?
Okay perfect, so basically the same thing but different notation
So
There is another way to look at the conditional probability
P(A|B) is basically just looking at smaller sample space
the sample space is now B
And you look at the events that fall in A and B at the same time
because if it isnt in B then its not in your new sample space kind of.
But honestly the dice example is the best and if it doesnt feel that comfortable yet then just use the formula to calculate
The intution will come naturally.
in venn diagram it gonna looks like this right
i can't understand why i have to divide it by P(B) aka the sample space
it should be just P(B)-P(A∩B)
the diagram looks like P(B)-P(A∩B)
Yeah the diagram is wrong
I mean, the diagram doesnt show the conditional probability
maybe this helps you
am i right?
i think its possible to draw (A' n B) on venn's diagram
okay yeah
i think i have done that before
you are correct
Yep
How did you calculate P(AnB)?
yep
yep

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Heya! Could anyone help me with this question for number 2?
2(-2)-11 is equal to what ?
I assume the ordered pair is (x,y)
so its a?
u answer my question first
-15?
ok, is -15 less than 5 ?
yea
then the solution pair is a solution of 2x-y<15
you have to do the same steps to find which is not the solution pair
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Can you pls help me wid this question?
@undone garnet Has your question been resolved?
<@&286206848099549185>
@undone garnet Has your question been resolved?
@olive vigil Read #❓how-to-get-help
Clearly you didn't
Asking a used channel and pinging helpers twice in the span of less than 5 minutes
ok sorry
<@&286206848099549185> any1 lol?
Looks like linear algebra, try asking in #linear-algebra
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how do I integrate 1/((x^5) + (x^4))?
I've tried integration by parts
doesn't seem to work
since switching them back and forth and what not doesn't seem to help
I've tried integration by partial fractions
can't seem to get the right answer
It seems to be a pretty simple question but idk what I'm missing/doing wrong
and there doesn't seem to be anything to substitute
so yeah, I'm running out of ideas
Factor out (x+1)
mhm
yeah I did that but apparently I did something wrong since I got the wrong answer
I'll send working out if u want
Please
it's messy though so I'll have to reorginse 1 sec
Haha alright, tag me when you're done so I se eit
obviously I've done somethign wrong since the answer is wrong but
idk what
lol knowing me I probably understood partial fraction's method wrong
ohhh
I'll type it out
so I split it into like 4 more fractions
like 1/x + 1/x etc
lol sry you do you
don't let me interupt you
hvna

wait now I'm confused
cause the extent to which my prof taught us was like using partial fractions to solve stuff like x^2 - 1
by splitting it into (x-1) * (x+1)
so turning x^4 into the four fractions at the start
looks alien to me
😂
can you explain what you did there?
You mean to separate it?
why did you turn x^4 into x^4 and x^3 and x^2 etc
I'm not sure if there's some rigorous process for it, I just subtract one from the exponent and repeat the fraction until I don't have any powers > 1 left
It works if you try it out now
Again, not in any way rigorous
didn't know you could do that 
It's only for when you fully factor the denominator of the original equation and there's some power >1 left over
Then you have to do this
ohh icic
so like if I have a (x+1)^2 left over
I turn it into x+1 squared and normal x+1
Yes
and add it to the list of bullshit I have to work through?
Yes
icic
Have you done any matrix work?
lmao no idea what that is 😂
I'm doing year 1 undergrad calc if that answers your question
😂
Haha alright, it doesn't take long to learn though and it's a lot easier to figure out partial fractions if you learn it
The method is called Gauss-Jordan Elimination
all these weird names...
But it uses something called a coefficient matrix
It's way easier than it sounds
I'm an actual idiot when it comes to Linear algebra and I figured it out in a day or two
:o
When I was in calc 2 I brushed off partial fractions because I thought I'd never use it
But it comes up often enough
lol all this calc is marking the end of me
I jsut wanna get it over with so I can take comp sci in year 2 🤣
Yeah the more you know though the better. It makes everything else way easier if you understand calc
Anyway, you good on that integral?
If you feel confident
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hello
Do you have a question?
i have an exam tmrw
yeah
Post it
a couple actually
this
What have you tried so far?
i tried to solve it as a normal inequality but that didn't work
photomath sloved it but i didn't understand the explaintion
Can you show me a picture of what you did?
its just a random messy paper
That's fine
wait
ill show you the right answer first
this
and this is the bit that i didn't understand
@alpine sable
they combined their terms into a single fraction
^
wdym exactly
ahhh im slow
exactly as i said
why is the x-2 still in the bottom tho
recall basic fraction addition/subtraction
i don't study math in english thats why im slow
they first subtracted 1 from both sides
and then expressed 1 as (x-2)/(x-2)
and then simplified
starting with your initial inequality, are you able to subtract 1 from both sides fo the inequality?
just do it in paint
like move 1 to the other side?
i never did math in english
idk the words for things
so yeah it sounds weird
what language do you usually do you math in
arabic
i mean your english is decent enough
so it shouldn't be that hard to follow these instructions
ik but my school teaches math in arabic
im not trying not to im just not good at it
if you know what "subtract" means
and you know what a side of an equation/inequality is
subtract 1 from both sides of the inequality
that should be a pretty simple step
but if you really insist
like move 1 to the other side
is how some would describe it
okay
but the x thingy
yeah i know i moved it to the other side
im just stuck at this
would you be able to simplify something like
$$\frac23 - 1$$
ℝamonov
1/3
no
thats what you mean
1/3
isn't correct
wait what
how are you getting 1/3
moved 2/3 then 1 - 2/3
idk what to use instead lol
recall the basics for adding/subtracting fractions
1 - 2/3 would be equal to 1/3
however
2/3 - 1 is NOT the same as 1 - 2/3
that becomes -1/3
ℝamonov
how would you simplify that
show your work mathematically
multiply by the reverse thing
show your work mathematically
whut
i don't understand what you're trying to do with that
like -2/3 x -3/2
you can do that to remove the -2/3
ik
im just saying is that the thing we did here
to combine fractions through addition or subtraction
you first need to get a common denominator
e.g.
showing the work for the simplification of $\frac23 - 1$ would be \
$\frac23 - 1 = \frac23 - \frac33 = \frac{2-3}{3} = -\frac13$
ℝamonov
i think ik what you meant now
ty
@gray isle wanna help me do another one?
its an easier one thought
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ayo
so i rlly don't know what to do here tbh. prof didn't mention an 'initial condition' in class
First of all, find y' and write out the whole equation
And then you just substitute the initial condition to verify that it works
so plug in -ln(6) = x and 3pi = y
no, $y=-\frac{3\pi}{\ln(6)}$
hvna
how do you figure?
when you plug in -ln(6) in the equation y you'll get 3pi
so coordinate for initial condition is (-ln(6), 3pi)
how do you get this from this information
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is it possible to solve birthday problem without using computer/brute forcing
The probability birthday problem?
yes
Yes
hits 50% at 23 people
i have this so far
Yeah you'll have a bunch of factorial floating around
what do i do from here
i have no idea how to approach this other than just plugging all the values in
What is your goal?
find that chance that coinciding birthdays is 50% at 23 people but symbollically, without plugging all values in
if that was incomprehensible i'll try better to explain
It isn't exactly 50% though
1st n in N st P>1/2
yeah
@alpine sable Has your question been resolved?
@alpine sable Has your question been resolved?
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Does this seem right so far
<@&286206848099549185>
I don't know linear algebra sorry
Still have to learn
Rip
How old r u
2nd line is wrong
why did you multiply x^T AA^T x?
unless AA^T is A?
like the A in the lhs
Yeah A is supposed to be M^TM
oh nvm it's fine
Example of what I'm trying to do but with A cholesky decomp
In this example A is just some random matrix
But I'm trying to prove for this A in a similar fashion
He's 22 ;)
What?
@alpine sable is 22
3 is c
Prime can be divided by 1 and his number
5 is a
Its less than 3 not less and equal
Last b is 7 a is is 24
4 i dont know
Literally lol
Wdym
im talking to ttk lol
4 is a
i thought you said that you didnt know tho
I searched
oh ok
@alpine sable ur the best u save me
@ebon steeple
Oh k i Wil try
3-4 is - 1 right
?
Can we use latex here?
yes
It would be better for explain
- means multiplied by
I know but what does / mean
division
When you divide an number which is an fraction u flip it
1/5 = 1 divided by 5
Remember to simplify idk if they teach it
2-5/6,multiply by 6 2, so u can get off the fraction
But that’s not a - that’s a negative for the 1 that why it’s hard
I don't understand
But thank you so much u explain the steps : )
(3+1/2+1+2/3) / 5 = (3+1/2+1+2/3) * (1/5)
make it so they all have the same denominator
i don’t know latex and i’m usually fine
No u all explain good thanks I finished the work sheet 
yeah what
good site choice
Thanks ;]
,w sin(pi/6)
guess that’s why
@ebon steeple close the channel if you’re done
Confuse me sometimes because they don't explain, but that's good so you figure it out
Trig is my weakness

From t/4 to pi/6, why

Apparently 30 degree is standard
@ebon steeple if you need help dont hesitate6

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how would i approach this calculus problem?
also when it says "the tangent line approximation" is it known from the question at what point that line is tangent to?
do you even need to know that?
im just very confused by this question
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I need help with a linear algebra question: Find the vector component of vector a orthogonal to vector b, if vector a = <3,-1,7> and b = <-4,-2,9>
Hmm
KurtDee
Does this make sense?
.open
?
oh thanks
yes, it's a projection
So I have a vector projection of a onto b, I found the magnitude and the direction; now it's asking for the vector component of a orthogonal to b
yes I expressed how it's done
So this formula would be the one I would use to find it?
👍
that should be everything
Appreciate it
remember you're solving for $\perp b$, not b
KurtDee
I thought in the forumla I posted, it was a1
or would it be a2?
because of this
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hello
i need some help with this
not really sure what to ddo once i have this infiormation
so i have the u and stuff
its gonna be x^3/3 (u)^5/5
right?
@quartz osprey Has your question been resolved?
du should be $15x^{2}dx$
RyanDuarte56
so $x^{2}dx=\frac{du}{15}$
RyanDuarte56
so the integral becomes $\int_{-1}^{4}\frac{u^{4}}{15}du$
RyanDuarte56
got it?
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any suggestions on how to solve this limit?
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no
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<@&286206848099549185>
anyone know how solve this limit?
Try the substitution n=-m
recall your definitions of e
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is hard
