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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The Answer of 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°))

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