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# Need help with this integration question! Watch

1. I'd appreciate if someone could show me how to solve this integral step by step.
Here is a link to the question: http://prntscr.com/bh28ci
Mark scheme: http://prntscr.com/bh28ys
I'd appreciate if someone could show me how to solve this integral step by step.
Here is a link to the question: http://prntscr.com/bh28ci
Mark scheme: http://prntscr.com/bh28ys
Have you done part a?

3. (Original post by notnek)
Have you done part a?

Yes let me draw it up on paint xD
4. (Original post by notnek)
Have you done part a?

http://prntscr.com/bh2hek
5. That's correct so far.

(I'll use 't' instead of theta):

t^2 f(t) = t^2 [4cos(2t) + 5] = 4t^2 cos(2t) + 5t^2

So now you have 2 terms that you need to integrate. 5t^2 is easy.

4t^2 cos(2t) can be integrated using parts. Have a go at that and post your working.

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Updated: June 16, 2016
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