Let a, b ≠kπ : .

Prove: cos^{2}\frac{\alpha- \cos^{2}\frac{\alpha- \beta }{2}=\frac{c^{2}}{a^{2}+b^{2}}.

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- February 23rd 2011, 12:38 PMarmequality trigonometry
Let a, b ≠kπ : .

Prove: cos^{2}\frac{\alpha- \cos^{2}\frac{\alpha- \beta }{2}=\frac{c^{2}}{a^{2}+b^{2}}. - February 24th 2011, 08:47 AMSudharaka
- February 26th 2011, 01:08 PMmr fantastic