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

question 232

Multiple Choice

Use an identity to write the expression as a single trigonometric function or as a single number.
- $\cos \left( \theta + \frac { \pi } { 2 } \right)$

• A) \(- \sin \theta\)
• B) \(- \cos \theta\)
• C) \(\sin \theta\)
• D) \(\cos \theta\)

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