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Math Help - Proving

  1. #1
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    Proving

    If b+c=pi, prove that 2(1-sinb sinc)= cos^2b+cos^2c.
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  2. #2
    Junior Member mrmohamed's Avatar
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    Quote Originally Posted by Tiger View Post
    If b+c=pi, prove that 2(1-sinb sinc)= cos^2b+cos^2c.

    Hi all

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