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Thread: trigonometry equations help

  1. May 6th 2009, 03:23 PM #1
    ineedmathhelp08
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    trigonometry equations help

    Solve each equation for x if 0 x 2π give your answers in radians using exact values only.

    sin x = -cos 2x

    I need help
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  2. May 6th 2009, 03:40 PM #2
    Referos
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    Try using the identity cos2x = 1-2sin^2{x}.
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