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Complete the Identity $\cos ( \alpha + \beta ) + \cos ( \alpha - \beta ) =$

Question 195

Multiple Choice

Complete the identity.
- $\cos ( \alpha + \beta ) + \cos ( \alpha - \beta ) =$ ?

A) $2 \cos \alpha \cos \beta$
B) $\cos \alpha \cos \beta$
C) $2 \sin \alpha \cos \beta$
D) $\sin \beta \cos \alpha$

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