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Math Help - Trig Identities

  1. #1
    Newbie
    Joined
    Jan 2010
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    1

    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. #2
    Senior Member nikhil's Avatar
    Joined
    Jun 2008
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    286

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    use
    (sinx)^2=1-(cosx)^2
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