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Math Help - simplify

  1. #1
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    simplify

    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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  2. #2
    Senior Member sakonpure6's Avatar
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    Re: simplify

    in your equation is it tan^-1(cos (A/2)) ? or are you missing an angle
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