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Math Help - Help! find all solutions to..

  1. #1
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    Help! find all solutions to..

    A, 0degrees </_ A < 360degrees to the equation cos(2A) = cosA

    (</_ means less than or equal to)
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  2. #2
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    Hint: Use the identity \cos(2\theta)=2\cos^2\theta-1.
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