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Trigonometric Identities

Trigonometric Identities

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Copyright © 2009 Pearson Addison-Wesley<br />

Half-Angle <strong>Identities</strong><br />

We can use the cosine sum identities to derive halfangle<br />

identities.<br />

Choose the appropriate sign depending on the<br />

quadrant of<br />

5.6-4

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