Trigonometric Identities
Trigonometric Identities
Trigonometric Identities
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Difference Identity for Cosine<br />
Point Q is on the unit<br />
circle, so the coordinates<br />
of Q are (cos B, sin B).<br />
The coordinates of S are<br />
(cos A, sin A).<br />
The coordinates of R are (cos(A – B), sin (A – B)).<br />
Copyright © 2009 Pearson Addison-Wesley<br />
5.2-4
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