A student came to me with this problem, and sadly I do not know how to finish this problem, any help, please?

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- Oct 19th 2010, 06:26 AMtttcomraderAn awkward cosine problem
A student came to me with this problem, and sadly I do not know how to finish this problem, any help, please?

- Oct 19th 2010, 07:21 AMPandevil1990
What exactly do you want to do with this?

- Oct 19th 2010, 07:23 AMCaptainBlack
- Oct 19th 2010, 08:15 AMtttcomrader
Umm... I'm still having some difficulties in expanding the right cos...

I have

So I should have

but then how do I simplify that? The answer should have been according to the book... - Oct 19th 2010, 11:16 AMCaptainBlack