Solved

Use a Product-To-Sum Identity to Rewrite the Expression

Question 284

Multiple Choice

Use a product-to-sum identity to rewrite the expression.
-sin(17s - 2) sin (4s - 5)

A) 0.5(sin(13s + 3) - sin(21s - 7) )
B) 0.5(cos(13s - 7) - cos(21s - 3) )
C) 0.5(cos(13s + 3) + cos(21s - 7) )
D) 0.5(cos(13s + 3) - cos(21s - 7) )

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