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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