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Use Identities to Write the Expression as a Single Function $\cos \left( \theta + \frac { \pi } { 2 } \right)$

Question 397

Multiple Choice

Use identities to write the expression as a single function of x or θ.
- $\cos \left( \theta + \frac { \pi } { 2 } \right)$

A) $- \sin \theta$
B) $- \cos \theta$
C) $\sin \theta$
D) $\cos \theta$

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