sqrt(1+cos a/1-cos a) = sin a / 1-cos a
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Originally Posted by anilvvkumar sqrt(1+cos a/1-cos a) = sin a / 1-cos a Hint: $\displaystyle \frac{1 - \cos a}{1 + \cos a} = \frac{1 - \cos a}{1 + \cos a} \times \frac{1 + \cos a}{1 + \cos a}$$\displaystyle = \frac{1 - \cos^2 a}{(1 + \cos a)^2} = \frac{\sin^2 a}{(1 + \cos a)^2}$
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