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Thread: Help! find all solutions to..

  1. May 6th 2009, 02:32 PM #1
    alexcross
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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. May 6th 2009, 02:40 PM #2
    vemrygh
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    Hint: Use the identity \cos(2\theta)=2\cos^2\theta-1.
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« tanB | trigonometry equations help »

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