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# Edexcel C4, past paper June 2010, Question 6, STUCK! Tweet

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1. Edexcel C4, past paper June 2010, Question 6, STUCK!
Hi, I'm revising for Edexcel C4, and I've got stuck on question 6 b on the June 2010 paper and I can't find any help on it anywhere! It's really starting to stress me out now!
Here's a link to the paper:
http://www.thestudentroom.co.uk/atta...3&d=1303768084

I've tried changing Theta to X to make it a bit easier to understand, then I've gone on to use integration by parts, but i just can't make my numbers work, if anyone could shed some light on how to do it, it would be much appreciated!
2. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
in part b, you are multiplying the function of theta (in part a) by theta, so the integral becomes, 1/2theta + 7/2thetacos2theta, with respect to theta
Then you can use integration by parts, between the limits of pi/2 and 0.

Hope that helps.
Last edited by RobG93; 14-06-2011 at 15:54.
3. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
You should get a multiple of pi^2 minus a fraction for your answer.
4. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
Do you know what the answer is? If it's (pi^2)/16 - 1/4 then I can help you...
5. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
I got (pi^2)/16 - 7/4...
6. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
(Original post by Annonymous_47)
Do you know what the answer is? If it's (pi^2)/16 - 1/4 then I can help you...
yeah, the answer is pi^2/16 - 7/4

:/ I'm still completely stuck...
7. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
(Original post by RobG93)
I got (pi^2)/16 - 7/4...
8. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
(Original post by RobG93)
I got (pi^2)/16 - 7/4...
Yeah that's right actually, I just found the answer
9. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
You need to do as RobG93 said and multiply f(theta) by theta. Then ignore the theta/2 to start with and use integration by parts on 7/2thetacos2theta part. Then integrate theta/2 and add the two integrals together and apply the limits. Or is that what you were doing?
10. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
I've got it now thanks guys!
11. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
Attached Thumbnails

12. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
Have you got the mark scheme for that paper?
13. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
Thank you
14. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
i didn't get part (a). can u please explain how we can prove that?
15. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
(Original post by b3ncarol)
i didn't get part (a). can u please explain how we can prove that?
16. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
Can anyone show me how to do question 3?!
17. Re: Edexcel C4, past paper June 2010, Question 6, STUCK!
(Original post by blahhblah)
Can anyone show me how to do question 3?!
http://www.examsolutions.co.uk/a-lev.../C4-Papers.php