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

Sin a_____=1/2 [sin (a + b) + sin (a - b)]-example-1
User Wenzeslaus
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1 Answer

10 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

User Grilse
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