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Thread: Trig Identities

  1. January 12th 2010, 07:15 PM #1
    arayjay
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    Trig Identities

    I need advice on how to prove
    sin^2 x - sin^2 2x = cos^2 2x - cos^2 x
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  2. January 12th 2010, 07:18 PM #2
    nikhil
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    use
    (sinx)^2=1-(cosx)^2
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