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Math Help - tan question...

  1. #1
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    tan question...

    Prove that tan^2(pi/7) + tan^2(2pi/7) + tan^2(3pi/7) = 21.
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  2. #2
    Junior Member mrmohamed's Avatar
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    Quote Originally Posted by scipa View Post
    Prove that tan^2(pi/7) + tan^2(2pi/7) + tan^2(3pi/7) = 21.
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