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8
volunteer
do you wanna work on 21 yourself? Just kind of prove where I went wrong.
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volunteer
Or do you want to keep going through it together?
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volunteer
Just to be honest, it's kind of helping my self-esteem after looking at your exam problems.
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student
are you upset due to those problems?
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volunteer
A little bit
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volunteer
It may just be
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volunteer
too early in the morning
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volunteer
Not really, but
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volunteer
um
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volunteer
those are also on the tip of my tongue. I just
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volunteer
anyway, I didn't, I didn't, um, I kind of followed you on the previous problem. I had no, I was so confused
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volunteer
I've always struggled with the um
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volunteer
with rig, uh
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volunteer
with these kind of trigger identities
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volunteer
or struggle is a strong word, but
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volunteer
tougher than most
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volunteer
I didn't really find any errors in your
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volunteer
formulation for number 19.
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volunteer
21. Let me
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student
it's fine. there were easier problem too. you 'd plenty of them
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volunteer
let me retry that property. So if we say sign of.
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volunteer
you don't have to try to soothe my soap, my, my ego here. I'm fine.
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volunteer
Um
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volunteer
so they say 9, so you said 90, say pie or two.
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volunteer
minus X Where does that come from?
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volunteer
This would give us negative cosine.
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volunteer
What about
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volunteer
sign of
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volunteer
X minus 52.
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volunteer
This would also give us negative cosine.
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volunteer
Does it though
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volunteer
of course I your device.
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volunteer
minus
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student
no, really. my teacher said to us try to do easier problem, you won't able to finish all of them due to time.
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volunteer
Oh, for the exam
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volunteer
Yeah
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volunteer
That's basically what you do for the SATs as well. Anything that's timed really.
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volunteer
You get the low hanging fruit, then you can focus on the harder problems.
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volunteer
Um
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volunteer
cosine is an even function.
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volunteer
So this becomes
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volunteer
one, so this just becomes cosine of X.
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volunteer
and then co-sign 5 to 0.
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volunteer
Huh
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volunteer
So that's the identity. So I got it wrong.
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volunteer
It's not
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volunteer
um X + y or 2 should be 2 minus X.
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student
i think both identities are right, but they went for second one.
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volunteer
Oh yeah, you're right
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volunteer
They're both right
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volunteer
Well, there you go
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volunteer
And I'm, I was
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volunteer
also surprised on oak. Shoot, what was the page number again? It's like 32.
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volunteer
Oh, so close
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volunteer
Um, I was also surprised why there was only one
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volunteer
inverse
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volunteer
problem
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volunteer
It was kind of, it, it kind of made it a little suspicious. I was like, are they just that difficult or are they that supposed to be easy?
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volunteer
But it seemed it's more towards the
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volunteer
easy side
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volunteer
to me to scratch that. Let me not say that because this is a very, this is one problem out of, you know, however many difficult problems there are.
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volunteer
may not generalize
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volunteer
Let me not generalize.
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student
there's another way to do it too. Gimme a min to think
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volunteer
Oh, really? Oh, I wanna, I wanna see your
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volunteer
Mm.
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volunteer
live in this one.
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volunteer
Oops sorry
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student
im unable to remember it.
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volunteer
What do you think it was?
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volunteer
Or what did I have
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volunteer
to do with
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student
i think it was letting such cos theta = x
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student
sin theta d theta = dx
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volunteer
But then you'd be stuck with the extras sign the term.
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volunteer
sine theta term.
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volunteer
I saw you working earlier.
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volunteer
You were um
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volunteer
trying that approach, but it just kind of dead ends.
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student
im not getting sin thetea in numerator
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student
yeah, not seem to work
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volunteer
Yeah, that's where I was getting stuck to.
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volunteer
Um
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volunteer
because once you have
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volunteer
your, your parameter, your D parameter where you just say T equal to
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volunteer
something
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volunteer
DX
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volunteer
If you can't rewrite this something in terms of tea.
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volunteer
say GFT, then
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volunteer
you can't really use it
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volunteer
in your inner gra
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volunteer
Ingra
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student
yeah, right. we need dt
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volunteer
right? And you need and you really need is um DX by itself.
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student
yeah
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volunteer
because it becomes kind of useless.
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volunteer
if you
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volunteer
introduce this parameter term, but then you get stuck
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volunteer
with some
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volunteer
you know, original ex term inside your
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