Sin a_____=1/2 [sin (a + b) + sin (a - b)]

Iacopo Boccalari asked Mar 25, 2023

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Iacopo Boccalari asked Mar 25, 2023

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11 votes

Answer:

$\textbf{A.} \cos b$

Explanation:

$\frac 12 \left[\sin(a+b)+\sin(a-b) \right]\\\\\\=\frac 12\left[ 2 \sin a \cos b\right]\\\\\\=\sin a \cos b$

Error answered Mar 31, 2023

by Error

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