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## Homework Statement

Its all part of a show that question from an example paper that I'm doing. Apart from this part I have the answer. Just wondered if anyone could show me the substitution that I would have to make.

Starting from [tex](\frac{sin3\gamma}{sin\gamma})^2[/tex], and ending up with [tex](1+2cos2\gamma)^2[/tex]

Other than this, I have the question right, and if I got to this stage in an exam, and couldn't do it after spending some time on it, then I'd just go to the final answer, and hope that its a logical step that I just haven't seen. But as I say I have the rest of the answer, its just this little part that needs manipulating.

Thanks

Brewer

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