Trigonometric Sum

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May 26th 2009, 03:51 PM
Valaina

Trig help.....

sin (alpha + beta) + sin (alpha - beta) = 2 sin alpha cos beta
May 26th 2009, 04:03 PM
pickslides

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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