#help-27
1 messages · Page 312 of 1
and i just figured out this discord server
ok wait
do u=3x^5
is that part clear?
ye ig
u can set u to whatever u want
like..
so here we set it to that
so the same thing
whats p??
ahh
why is it not loading for me
click the image to load it faster
no
u can put them in the brackets
ohh
just replace
oh
what did u set u equal to?
what did u set p = to?
since there equal u can replace them
3x to the power of 5
exactly
so like this
u see how much nicer it looks
now u can expand it easily right?
what abt the y to the power of 3
we did p = y^3
wdym
u should not be struggling this much 😭
nah its fine
and this work is so dumb
ye
lemme see
how are ur friends doing are they also struggling w this?
i guess its fine
.
get atleast 1 friend frfr
hmm
wait
the dot between u and p is a times
replace every u here by 3x^5
on ur paper
send me a photo of how it looks like
alr
the first u has a power of 2 on top
what would i do
@past moat
and how would i do that
bracket it
(3x^5)^2
ok
if greater can help u its fine
okay
(3x^5)^2 - 2(3x^5)(y^3)+(y^3)^2 @past moat
(x²)² = x power 2 times 2
okay
oh ok
ill save this
Deal
Deal means okay
oh ok
now did i finish this question?
or is there more
@past moat
uhh
@past moat ?
.
.
.
.
Sorry back
More
its ok
9
What does the rule say
Do ( y³)²
So whats the full equation now

wdym
First one
oh
oh really?
thank you
thank you
very much
can i friend you on discord @past moat
or do you not allow it
thanks
Np
wait
what are ur like help hours
yes but i dont have time to ask today srry
Idk just dm me if im free i respond
ok thanks
ill re open tmrw if i need help
All good take A screen shot tho i am curious
alr
i will
thanks thats all i had
@past moat
do i close this
or will you?
.close
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Hello
$0\le x\le 1$, and the circle bounds too.
mathisfun
And also I thought √(1-x^2) was a semi circle
It is.
Isn't that radius?
Did you read the first line of the solution?
No. Those are the bounds on x.
Look, $y=\pm\sqrt{1-x^2}\implies x^2+y^2=1$.
mathisfun
Obviously, this is a unit circle.
I get that
We have the bounds $0\le x\le 1$, so...?
mathisfun
Then why is the left half of the circle missing?
Oh
OH
I realized we haven't converted into polar yet lol
Because of the bounds...
Ok.
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soccer she won 1/3 out of 3, could have won: 3 won: 1
basketball she won 1/2 out of 2, could have won: 2 won: 1
in total she could have won: 5
other options should be fine too, but is 5 a valid answer also ?
No.
What is 5/3?
And 5/2?
The point is, it is 1/3 of her total trophies
and 1/2 of her total trophies
I dont think thats what the text says
1/2 od her total trophies in basketball
so not her total trophies
How can she win a half of a trophy??
"She won half of her trophies for soccer"
She physically cannot win half of her trophies.
I thought that the text said that she won 1/2 of basketball trophies
not that half of her trophies are from basketball
No
Like I said, physically impossible.
then yeah its not correct
This is a very badly worded question.
what would happen if the question was:
she won 1/2 of all basketball trophies
she also won 1/3 of all soccer trophies
how many trophies could grace have won ?
would this be true ?
soccer she won 1/3 out of 3, could have won: 3 won: 1
basketball she won 1/2 out of 2, could have won: 2 won: 1
in total she could have won: 5
If trophies was an object, yes.
got it, thanks for the help
Ibwould say the answers is miltiples of 6
Ib?
I would
To the original problem? Yeah, I just read it wrong
Ic
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uhmm how to find the minimum points to this type of graph?
this si the full question if needed
@mortal aspen Has your question been resolved?
you can apply the fundamental theorem of linear programming
https://en.wikipedia.org/wiki/Fundamental_theorem_of_linear_programming
In mathematical optimization, the fundamental theorem of linear programming states, in a weak formulation, that the maxima and minima of a linear function over a convex polygonal region occur at the region's corners. Further, if an extreme value occurs at two corners, then it must also occur everywhere on the line segment between them.
uhmmm but the corner points its showing as incorrect
thnkk u
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why im i not getting zero
since
Because of floating point error
what is that?
Computers store real numbers in an approximate form
numbers in computers arent the actual number but just a really close aproximations
sooo, instead of 0, you get like: 0.0000000000000008
Yes, a general real number takes an infinite amount of data to specify
oh wow
yeah, kinda, they just use really precise aproximates, but sometimes it leads to this kind of things, just assume that its equal to 0
A computer can exactly store some real numbers, everything else gets rounded to one of them
so the integral is just equal to zero
desmos has the bad tendency of not doing the rounding on these kind of problem for some reason
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Why?
Cause I need help
I alr did
Then wait there please
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I need help at Calculate limit limes,
<@&286206848099549185>
!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
ill guess those symbols mean taking the limit from x to +infinty and x to -infinity
Yes
$\left( a+b \right)\left( c+d \right)=ac+ad+bc+bd$
zzz0nnn
If u want I can send you the original paper
yeah, prob useful
The 1b
you have to evaluate the multiplication in this case, if you are quick, you will eventually find you get x^4 as the biggest term related with x
still, try to do the full multiplication of terms
Mhhh
I get it, im confused bcs look at 1a the dominant is x^4
And at 1b I just read it like the first one or must I add the one x3 with the other x so I get x4
you could also evaluate by solving both
i guess you already figured that for +infinity its just +infinity
-infinity . -infinity would also lead you to the same answer anyways
x.x^3, = x^4
you could also follow this route
since x and x^3 have odd exponent, you retain the negative sign
Ah I might have the solution
Hear me out
Look at first bracket the highest exponent it’s x^1 why 1 bcs if there is a variable with no exponent it’s 1, so and now look a the second bracket the highest exponent is x^3 so if you multiply them with 5 u get 5x^4.
Why 5 bcs with the five u can decide wether + infinity ♾️ or - infinity ♾️
I think so it’s right
Lemme ask gpt
Now I get it Bro thx for your help
@young spade
If I got another problem I let u know
@restive river Has your question been resolved?
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$1,(4)\sqrt{75} * (-2,4\sqrt{50}) * (-1/{26} \sqrt{18})$
Simon
i kept trying this problem and i keep getting it wrong for some reason
$\frac{4}{9} * 5\sqrt{3} * (\frac{24}{10}* 5\sqrt{2}) * (1/26 *3\sqrt{2})$
Simon
4/9 would be 0.4444...
not 1.444....
@regal berry Has your question been resolved?
@regal berry I am confused, what are you trying to do?
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yeah, im a little stuck on this, tried making the equations for x1 x2 x3 and x4 but it just confused me, as x3 has an x2 value in its equation
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Minor question. could someone explain this to me, I'm not sure exactly whats being asked of me. I dont "remember" 
if this is instructor feedback on your submitted work, I think they're just saying to put the "for all (...)" junk before the rest of the statement
although, by the comment, it almost sounds like the instructor didn't see that you did include the quantifiers, just after the statement
because like, you did repeat the quantifiers
i thought so, I just wanted to make sure to avoid doing something wrong again
maybe they mean to repeat the quantifiers exactly? idk
in practice, you don't need to explicitly state the contrapositive in a proof, but it certainly helps for legibility
e.g. "Let a,b,c be integers. It suffices to demonstrate the contrapositive, i.e. that if a | b or a | c, then a | bc" and then proceed
my prof is really hard about this stuff for a discrete 1 class 
appreciate your help tho, u can close it if you'd like
you know, after seeing the wacky things students do with proofs, I get it
you do have to genuinely know how to identify what's logically correct before allowing yourself to bend the rules to help the writing style
otherwise you tend to sound like a loon lol
"too handwavy" etc
it'll pass
after your first proofs class, the instructors assume you can write a proof
and the content will shift away from the proofwriting itself, although it's still definitely important
it's like knowing how to cite your sources before taking a literature class I guess?
i transferred credits from a uni a few years ago and they somehow gave me discrete 2 credits and not discrete 1 credits. I've never taken a discrete 2 class in my life
there's a chance your equivalent counted for both
someone in my "discrete math" class transferred into a uni that splits the two in their CS program, and he got credits for both
I checked with my advisor and it didnt, thats why i gotta take this class after forgetting everything already
oh word
should've waited for an online summer course and speedran 
eh it's whatever
the hard stuff is good for you
plus if you do well, you can be elitist about it and critique other peoples' proofs in the same way lmao
oh but seriously, if you're in math the proofwriting is obviously very important, but if you're in cs, if you come up with a new algorithm or encryption protocol etc., you can write an accompanying math paper to prove its efficiency and efficacy
man, i wanna finish this course and never think about this again. I spend so long going to math labs and whatnot to try and finish hw and portfolios and still dont understand a single thing to retain it but enough to get the work done
the vibe seems to be that discrete math is just the vessel through which proofwriting and logic is taught to students who have previously never been asked to prove anything, ever
i understand how proofs works, its just discrete math vocab if that is the right term is just so tedious, it flies over my head for some reason
that's all vocab honestly
anyway, i should get back to finishing this stuff. thank you for the help again
no problem, have fun
@dusk pilot Has your question been resolved?
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have I done something wrong? how do I continue from here?
A tan appears to have disappeared.
When you got rid of the square root you removed a tan.
There’s another tan x in that expression.
So you really have tan squared when the dust settles.
Where are you stuck this time?
To be honest, this is still hard to integrate.
I was hoping to change the integral to 16(sec^2 - 1)sec^2
You then have to integrate sec^3 which will require some IBP.
book doesn’t integrate so that means I shouldn’t right‼️
I assumed the point of the problem was an integration exercise!
Umm… did the book just leave it there
If you wanted to complete the integration you would have to do this. ^
I don’t think I wanna 😭😫
But maybe it’s just trying to show you the situations in which you should think of a trigonometric substitution?
perchance
These are the rest
maybe I WILL get an answer at some point
but thank u for the help
If you know about hyperbolic functions, a hyperbolic substitution is much easier.
as a matter of fact I do not know hyperbolic functions
Ah. Essentially, these functions are versions of sine and cosine but they parametrise ‘hyperbolas’ instead of circles. If you don’t know about them, then I guess you do only have one way to do it
I’ve given up with actual answers and I think I’m just gonna leave them as integrals
I do believe that is probably the intention
I done some before
and in those I was actually getting answers
but they are a little different
and just to check
that answer is correct right…
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I am proving that if a function is entire, then there exists a function F such that F'(z) = f(z).
I begin by defining $F(z) = \int_0^z f(z) dz$
Then taking the derivative we get
$$F'(z) = \lim_{h \rightarrow 0} \frac{1}{h}[F(z+h) - F(z)]$$
$$ = \lim_{h \rightarrow 0} \int_z^{z+h} f(z) dz$$
Which by the MVT for integrals is
$$f(c)(z+h-z) = hf(c)$$
So the h's cancel and you get
F'(z) = f(c) for some $c$ in that range, however how do I conclude that its eqal to f(z)? Do I just use the fact that the h in the bound approaches 0? Then I can't use MVT
Bean Man
@mortal tinsel Has your question been resolved?
<@&286206848099549185> please
@mortal tinsel Has your question been resolved?
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F(x)= 1/(x-6)^2 How would i go about getting the derivative of this
chain rule
How is that done i forget the names of the formulas
In this section we discuss one of the more useful and important differentiation formulas, The Chain Rule. With the chain rule in hand we will be able to differentiate a much wider variety of functions. As you will see throughout the rest of your Calculus courses a great many of derivatives you take will involve the chain rule!
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the reduction formula isnt something ive learnt; how can I integrate (tan^2x)/(cosx); and if it's a u sub of sec^2 or tan how would i know generally what one to make?
You can rewrite $\frac{\tan^2(x)}{\cos(x)} = \tan^2(x) \sec(x)$
King Leo
Then use $u = \tan(x)$
King Leo
This looks like integration by parts, but you dont need that
what do i do next?
What u are you using
And what integral exactly are you trying to solve
Youre selling 😭
Oh wait
Im selling
No wai
Youre selling
No wait
Wtf
Im selling
,w derivative tan(x)
,w derivative sec(x)
@devout yarrow Has your question been resolved?
<@&286206848099549185>
@devout yarrow Has your question been resolved?
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We have a vehicle at (0, 0). It can take 6 movements to NSEW, but it must end up back at (0, 0). What are the total number of unique paths it can take? I was having a lot of trouble with this problem on my midterm.
The solution I got was fixing 2 positions out of 6, then out of 4, and selecting an axis for each combination.
So I got 2nCr(6, 2) * 2nCr(4, 2) * 2nCr(2, 2). Then added for fixing 3 positions out of 6, which was 2nCr(6, 3).
So my final solution was 2nCr(6, 2) * 2nCr(4, 2) * 2nCr(2, 2) + 2nCr(6, 3).
Did I overcount when multiplying nCr(2, 2) by 2? But for these positions, there’s still two axes of movement to select.
i would select pairs of moves instead of individual moves
Yeah, I meant each fixed pair to be a NS/EW pair
But I didn’t multiply against 2! to prevent overcounting
ahh ok
Does anyone have a solution?
i got 400
How??
3 North, 3 South: 6! / (3! * 3!) = 20
3 East, 3 West: 6! / (3! * 3!) = 20
2 North, 2 South, 1 East, 1 West: 6! / (2! * 2! * 1! * 1!) = 180
1 North, 1 South, 2 East, 2 West: 6! / (1! * 1! * 2! * 2!) = 180
Damn
So I only got the 6 choose 3 portion correct
Yeah I overcounted on 2nCr(2, 2) 🤦♂️
Thank you anyways
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i cannot comprehend the step to give 2x on top 🤦♂️
see the 1/2 in front
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I have no clue how to do this
can someone help me, please?
!occupied
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Is this a name related to a text book or something
Because there is no mention of the matrix A here
oh i can send a picture of what A is
M is
yeah maybe ill try to figure on my own idk how tis work
like this is what i have
I know the answer i just dont know how to get it
this is A
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therefore DNE
but the answer key says +oo
+infty is a form of DNE
oh ok
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Q1a
I believe I can use kirchoff’s current law, but I’m not sure how to progress from there
Do I use the current equation for the inductor L
Or is this more appropriate for the physics discord
@quasi agate Has your question been resolved?
@quasi agate Has your question been resolved?
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Can someone explain to me how the Monty Fall problem is different to the Monty Hall problem? It seems that in both we are given that Monty opens a dud door, so where is the difference?
wtf is a monty fall problem
i also wanna know
I was gonna joke that the Monty Fall problem was Monty Hall tripping down the stairs of the LMAD set
But uhh
it actually is lmao
It's just the Monty hall problem but he opens the door to the goat by accident
I found it from twitter: https://x.com/pli_cachete/status/1892025275346452774?t=HAvWlG1p7r6879mJMT3aEA&s=19
Many people have convinced themselves that they understand the Monty Hall problem after someone explains it to them, but then get the question wrong when you slightly tweak the question
ngl i also don't quite see where the difference is
Yes there is an argument about it
People say that if he randomly opened a door then it's no new information and you should stay with your original choice
However the problem is stated as if it's given that he opens a door with a goat
Does that affect things?
actually i think i got it
the difference from the original MH is that the host weights the sub-branches for Car 2 and Car 3 differently
being 1 for the goat door and 0 for the car door
@cold rivet Has your question been resolved?
I think 2 cases
- he opens our door
Car -> we win
Goat -> switch then 50/50 - he opens another door
Car -> we win
Goat -> should be as before 2/3 if we switch
@cold rivet Has your question been resolved?
@cold rivet Has your question been resolved?
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guys i got an answer to a question but its wrong
the approximation there is the answer my calculator gave (the 1.76 one)
but i was like .4 out
send your work
what is this handwriting
LOL
wrong
-1
oh
then you need to learn to use better handwriting because thats your own -2
thats the bottom limit in the red circle
shit it is??
yes, you need to fix your own handwriting before it bites you in the ass
its better than this in school i promise
well the point is that you need to make it a habit or else it will bite you in the ass
in math, your handwriting doesn't need to look pretty, it only needs to be perfectly legible
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what after this??
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I tried twice but I don't get the correct result. The first part in the bracket I get 0.454, while the second is 1.999. After multiplication with 4.3 I get -6.647
are those decimals exact or approximations?
approximations
I mean I calculate and take 3 numbers after the . if thats what u mean
anyway, we need to see all of your work to diagnose what is wrong with it -- your answers for the two penultimate steps don't tell us much
yeah that's exactly what you are NOT supposed to do
how should i approach it then? If i go with fractions and not with decimals numbers are just too big
sorry if my english is bad for math lol
you need to do it with fractions, but i am pretty sure you can simplify things along the way so they never get too big.
I'll try with fractions rn
show all your work and not only the answer
I'll take a picture when i finish with fractions
k
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guys, how to know which method to use for this question? is it the left one or the right one?
based on the mark scheme, the correct one is the left one
wait why is this wrong?
you have an extra 1/2 in the second term
ohhhhhhh i get it now
thank you sooo muchh guysss!
hi!
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my answer: (including image) In measure 2, where a subsidy of s euros is given to sellers so that the price for the buyer is equal to pmax, this causes an increase in both the producer surplus and the consumer surplus, it also causes a shift downwards/to the right of the supply curve of size s, (the size of s is 20, because the subsidy applies to suppliers from q = 10 up to q = 30, 30 – 10 = 20.)
From q = 30, the new equilibrium is reached. And consumers are no longer willing to buy a house above p_max.
The deadweight loss is formed at i. These DWL represent buyers who buy a house that they normally would not have paid that much money for. The government subsidy runs from q = 0 to q = 30 with a height of 20, (pmax to pmax + s )
Consumer surplus in market equilibrium: A + B + D
Consumer surplus after subsidy: A + B + D + E + F + H
Producer surplus in market equilibrium: C + E + F
Producer surplus after p_max: C + E + F + B + D + G
Welfare: A+B+E+C + D + F + G + H - I
Deadweight loss: -i = change in welfare = -DWL
Government Costs = B + E + D + F + G +H + I
The original question:
In recent years, the price of owner-occupied homes has risen dramatically, making it a problem for
starters1 in particular to find an (affordable) owner-occupied home. The government is
therefore considering measures to accommodate starters on the housing market. Two possible
measures are: 1) setting a maximum price pmax for owner-occupied homes; 2) giving a
subsidy of s euros per home to sellers, such that the price of a home becomes equal to
pmax.
c) (4 pts.) Use the analytical framework from Chapter 9 to
analyze and compare the effects of both measures. Assume that the owner-occupied homes are all identical.
In your analysis, specifically address the welfare effects for buyers of owner-occupied homes,
providers of owner-occupied homes, and the government.
My question is, is the subsidy rectangle right? i'm conflicted between D + F + G + H + I and B + E + D + F + G +H + I
i'm also not sure if I got the welfare effect right
Also I'm not even sure if the subsidy makes sense, here in my image, because the measure 2 is proposing a subsidy to the point it reaches p max, for each home for the seller. where (I believe) the buyer pays (up to?) pmax.
but then the subsidy would go beyond q = 30 right? so idk im stuck
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hii
,w (a-bi+1)/(a+bi)
bruh nvm
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What is x²+y² while x+y= 5*√2 ,x*y=6?
(x+y)^2=x^2+y^2+2xy
Yes. 25*2=(x+y)²=x²+y²+2xy=x²+y²+12 -> x²+y²=50-12=38.
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I dont know what mistake im doing
dont mind the bottom trig stuff
just fixed the sign mistake above, still not right
I might have figured it out?
in the process, I have to solve for dx
which is going to be du/cosx
right?
nah, it was the same thing i was doing, just explained better
help ;-;
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Hello!
I will spare you the background information, if you want it go ahead and ask and i can shortly explain it
Question:
Imagine two circles that do not have the same radius placed at constant distance from each other connected through a rod that has constant length. If you rotate the larger circle (or the smaller one, doesn't matter) how much will the smaller circle rotate?
I know that the circles can't do a full rotation but there must be some formula to describe their movement in the part of the rotation where they can move.
I have tried describing the connecting rod in terms of the known variables, R, r, D, L but I get en expression that seems a bit too convoluted
?
Which is the rod in your figure?
Aah ok
Sorry hope it is clearer now
A relation between alpha and theta is reasonable
You think?
You can assume a coordinate plane and parametric coordinates,
Then you would technically have the equation using distance formula
It would be ugly but you would have it
Maybe a more cleaner relation between d(alpha),d(theta) is what you want?
Yeah i would like to specifically have a function alpha = f(theta)
Are alpha and theta changes/ how much they rotate by?
yeah i guess
In this picture i did alpha+ delta_alpha
So maybe saying delta_alpha = f(delta_theta) would be better
Im not convinced such a function would exist,i mean just intuitively, like suppose it changed by delta theta at first and then changed by it again, intuitively feel like alpha would be different
yeah most definitely
Right now i am doing it using numerical methods in matlab and the change in angle is not constant
But it would be nice to have an analytical solution instead, or atleast one that doesnt use guesses
So without any change?
Yeah
Yeah that i have figured out already
One last question then
Whats the q tho
Btw i do think a differential equation is possible which would be satisfactory
I do*
Do you think the bottom expression here would give an answer if i were able to solve it?
Yeah seems good
I will try to stick it into matlab then 🙂
After that you can implicit differentiate to get the differential
interesting, i'm trying to make a model for this in geogebra
Go ahead, that would be great
i need you to explain how you construct the initial connection
in a bit more detail
if you start like this in EF then you can't move it as to rotate the circles you will need something of length more than 5
if you start out with an initial config like this, where EF is more than 5, then it seems like there's too much freedom
Yes
That position will never happen in my model
This is a mechanical issue to begin with and i know there are limits
How do you mean there are too many freedoms?
like there will be many possible cases and configurations that are kinda hard to categorize
at least the way i see it rn
even here, if i make the angle FAC bigger, there is no way i can move point E to keep the distance at 6 units
your lines here are already of very different lengths
I will record the solid edge model wait a little
actually nvm it's doable
Here is the movie
Can i upload it as a video in discord 🤔
There we go 🙂
Is you can see it breaks on some angles
Which is completely fine, it would almost be great if that showed in the final function because then i know the measurements are incorrect
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Okay I’m just stuck on a easy trig question I’m trying to find angle c
I mean this is easy but I haven’t done trig in ages 
rewrite to sin(c)=?
what do you get?
is?
is your calculator on radians?
Degrees

98.65+56.75+24.6=180
Nah but the sides
Are not suppose to exist
Isn’t the largest angle=largest side
And smallest angle=smallest side
yes
So why 98.65=7 and 56.75=11
,w asin(11/5.475*sin(24.6 degrees)
,w 0.9906 radians to degrees
,w 0.561234 radians in degrees
Calculating angle a?
Please show the original problem, exactly as it was stated to you, with the entire original context. A picture or screenshot is best. If the original problem is not in English, then post it anyway! The additional context might still be helpful. Do your best to provide a translation.
I don’t have OG, it’s:triangle abc is a non right triangle. Side c measures 11 and side a measures 7. Angle B measures 24.6 what is angle c?
so where did you get 5.475 from?
Law of cos
,w 11/5.475*sin(24.6 degrees)
,w sqrt(11^2+7^2-2(7)(11)cos(24.6 degrees))
I think I know
So after this
I realized the mistake
I think I treated this like a ssa or ass case
So I did 180-56.75
And got 123.244
And it just worked
So I think it’s just 123.244
okay
I’m not certain though
Law of cos if I recall does create a ass case right
It’s been so long since I’ve done trig
Yeah I think it’s accurate
if it works, it works
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i'm confused how a square root of a square root work
i have the question sqrt of sqrt of x^12 and it asks to "write a simplified equivalent expression using exponents"
and the answer is x^3
how does that work?
you can express a square root as 1/2
as in, square root of x = x^(1/2)
sorry if my handwriting is a little rough but there's an example
i see
so the square root of x^12 would be x^12(1/2) which is x^6
and then you just do it again to get x^6 to x^3
sweet
yes
thanks mr apple

