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The product 2 sin A cos B equals
Asin(A+B) + sin(A−B)
Bsin(A+B) − sin(A−B)
Ccos(A+B) + cos(A−B)
Dcos(A−B) − cos(A+B)
Answer & Solution
Correct answer: A. sin(A+B) + sin(A−B)
Adding sin(A+B) = sinA cosB + cosA sinB and sin(A−B) = sinA cosB − cosA sinB leaves 2 sinA cosB.
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