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Use Identities to Write the Expression as a Single Function $\theta$

Question 426

Multiple Choice

Use identities to write the expression as a single function of x or $\theta$
- $\cos \left( \theta + 90 ^ { \circ } \right)$

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

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