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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Definitions:

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