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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- Feb 23rd 2011, 01:38 PMarmequality trigonometry
Let a, b ≠kπ : .

Prove: cos^{2}\frac{\alpha- \cos^{2}\frac{\alpha- \beta }{2}=\frac{c^{2}}{a^{2}+b^{2}}. - Feb 24th 2011, 09:47 AMSudharaka
- Feb 26th 2011, 02:08 PMmr fantastic