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marin [14]
2 years ago
5

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

Mathematics
1 answer:
QveST [7]2 years ago
7 0

Answer:

\textbf{A.} \cos b

Step-by-step explanation:

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

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