Well, are you? See if you can figure out this 12th grade math problem. I'm taking calculus and I need help from the bright minds on UG.

First problem: Use integration by parts to evaluate integral of arccos(2x)dx.

My guess is
u=arccos2x, dv=dx, du=-1/(1-x^2), v=x
("?" in this case is integral symbol)
uv-?(vdu) = x(arccos(2x)) + ?(x/((1-x^2)^(1/2)))
but that's as far as I got.

Second problem: Evaluate the integral of 2cos(ln(t))dt by using a substitution prior to integration by parts.
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Last edited by yoshixxx7 at Mar 9, 2007,
what the **** is an 'integralof'???
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^^ 'Integral of'...?

If you'd asked me that a year or two ago I would have been able to answer that no problems. I've got an A in A level maths, but I've not as much as thought about Intergration since then!
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what the **** is an 'integralof'???

Ok I fixed that issue. I didnt have the symbol ? on my keyboard so I had to search for it on google.

EDIT: Wow it doesnt show the symbol....
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Hey y'all!!! Me and my friend were over at her house. I we were wonder what guys think when they see a hot girl at the mall or whatever walk by. (We're both pretty as y'all would say "blonde" sometimes).

Quote by rabidguitarist
I just look like some homo.
I dropped out of calc...
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Oh, sorry. i cant help. Is 12th grade not the equivalent of year 12?

I usually use this website when im stuck though, its really useful but im not sure if it goes past A level

www.mathsnet.net
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thanks alot for discourageing me completely
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I'm at University, and I don't think I can understand that. They just make some simple stuff overly complicated. Karnaugh maps etc..
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Well as I passed grade 12 and am now first university, I would think so.

However, I must applaud you on your attempt to get UG'ers to do your math homework.
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boy, thanks for ruining maths for me, now i'll never take it for my A level
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Well as I passed grade 12 and am now first university, I would think so.

However, I must applaud you on your attempt to get UG'ers to do your math homework.

Indeed. I'd consider helping had I not been doing this stuff this morning.
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Indeed. I'd consider helping had I not been doing this stuff this morning.
Try the couple steps up from that stuff... Not fun.
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Year 12?

Eh, I dont feel so stupid then