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Thread: Trigonometric Sum

  1. May 26th 2009, 03:51 PM #1
    Valaina
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    Question Trig help.....

    sin (alpha + beta) + sin (alpha - beta) = 2 sin alpha cos beta
    Last edited by Valaina; May 26th 2009 at 04:15 PM.
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  2. May 26th 2009, 04:03 PM #2
    pickslides
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    use the following identities

    sin(\alpha+\beta) = sin(\alpha)cos(\beta)+cos(\alpha)sin(\beta)

    and

    sin(\alpha-\beta) = sin(\alpha)cos(\beta)-cos(\alpha)sin(\beta)<br />
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