am trying to prove that

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- April 10th 2010, 06:51 AMsigma1proof of trig identity
am trying to prove that

- April 10th 2010, 06:54 AMSudharaka
- April 10th 2010, 07:05 AMsigma1
i have tried but i seem to be getting no where with this one.

- April 10th 2010, 07:36 AMSudharaka
- April 10th 2010, 07:53 AMArchie Meade
Hi sigma1,

if it looks confusing with "A" in both,

you can rewrite it as

where X=4A, Y=2A

and

When you work this out, you will have cancellation of terms in your fraction,

leading to the result.