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# Integration by parts

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1. Hi! I know how to do part (i) but I'm struggling with the second part, thanks!

2. So becomes?
So the integral becomes ?
3. (Original post by B_9710)

So becomes?
So the integral becomes ?
Yeah I got the double angle formula to sub. it in but I don't know where to go from there!
4. so

Just rearrange these integrals to find
5. (Original post by rpnom)

Hi! I know how to do part (i) but I'm struggling with the second part, thanks!
Following B_9710's post, integrate x cos^2x by parts, and the second integral is trivial.

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