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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use the following identities $\displaystyle sin(\alpha+\beta) = sin(\alpha)cos(\beta)+cos(\alpha)sin(\beta)$ and $\displaystyle sin(\alpha-\beta) = sin(\alpha)cos(\beta)-cos(\alpha)sin(\beta) $
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