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C4 Jan 12 Edexcel Post Exam Discussion - Solutions in first post

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Original post by Alpha5
Hi, thanks for the advice. I think I will defo retake as I really want an A*. In terms of exams in June I have 4 with the retake, spacing between them is good aswell. I basically need quite low grades to average the a grade in everything. So I may go all out.
Buy thanks again for your help. Good luck.


Okay, well considering that, I'd say you definitely should resit then - Good luck with your exams! :smile:
2 sin 3x sin 2x dx

Can anyone help me please?i know its very simple , but i cant get my head around it .Thanks
Original post by Whatever9999
2 sin 3x sin 2x dx

Can anyone help me please?i know its very simple , but i cant get my head around it .Thanks


You have a product of two trig functions there...

If you didn't get the hint:

Spoiler

Original post by Whatever9999
2 sin 3x sin 2x dx

Can anyone help me please?i know its very simple , but i cant get my head around it .Thanks


Use the factor fomula to write it in terms of cos.

cosPcosQ=2sin(P+Q2)sin(PQ2) \displaystyle cosP-cosQ=-2sin\left(\frac{P+Q}2\right)sin \left(\frac{P-Q}2\right)
Reply 484
bump
Reply 485
bump - check out the link in the first post to the june 2011 thread which contains stacks of past papers model answers etc
Reply 486
arsey, will you do solutions on edexcel fp2 and fp3?

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