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    Tcol55006's Avatar
    Tcol55006 Posts: 1, Reputation: 1
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    #1

    Mar 18, 2011, 06:17 AM
    use trigonometric identities to verify
    cos(u+v)cos(u-v)=cos^2u-sin^2v
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    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Mar 18, 2011, 06:34 AM

    Use the identities:
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