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Math Help - prove identities

  1. #1
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    prove identities

    prove identities

    cotx - cot2x = cosec 2x
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  2. #2
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    Quote Originally Posted by manutd4life View Post
    prove identities

    cotx - cot2x = cosec 2x
    cotx - cot2x
    = cosx/sinx - cos2x/sin2x
    = (cosx*sin2x -sinx*cos2x)/sinx*sin2x
    = sinx/sinx*sin2x
    = 1/sin2x
    = cosec2x
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