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

Question 155

Multiple Choice

Use a product-to-sum identity to rewrite the expression.
-cos 20° sin 45°

A) 0.5(cos(65°) - cos (25°) )
B) 0.5(sin(65°) - sin (25°) )
C) 0.5(sin(65°) + sin (25°) )
D) 0.5(cos(65°) + cos (25°) )

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