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

Question 71

Multiple Choice

Use a product-to-sum identity to rewrite the expression.
-sin 41° cos 28°

A) 0.5(cos(13°) - cos(69°) )
B) 0.5(cos(69°) + cos(13°) )
C) 0.5(sin(13°) - sin(69°) )
D) 0.5(sin(69°) + sin(13°) )

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