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The product 2 sin A sin B converts to which difference?
Acos(A+B) − cos(A−B)
Bcos(A+B) + cos(A−B)
Ccos(A−B) − cos(A+B)
Dsin(A+B) − sin(A−B)
Answer & Solution
Correct answer: C. cos(A−B) − cos(A+B)
Subtracting cos(A+B) from cos(A−B) leaves 2 sinA sinB.
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