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Use an Identity to Write the Expression as a Single cos⁡(θ+π2)\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⁡(θ+π2) \cos \left( \theta + \frac { \pi } { 2 } \right)


A) −sin⁡θ- \sin \theta
B) −cos⁡θ- \cos \theta
C) sin⁡θ\sin \theta
D) cos⁡θ\cos \theta

Correct Answer:

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