How to prove

$$\frac{-2sinA}{1-cosA}cos(A/2)tan^{-1}cos(A/2)=\frac{\pi^2-4A^2}{8}$$

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- February 16th 2014, 08:38 AMSuvadipsimplify
How to prove

$$\frac{-2sinA}{1-cosA}cos(A/2)tan^{-1}cos(A/2)=\frac{\pi^2-4A^2}{8}$$ - February 16th 2014, 10:35 AMsakonpure6Re: simplify
in your equation is it tan^-1(cos (A/2)) ? or are you missing an angle