Multiple Choice
Use a product-to-sum identity to rewrite the expression.
-cos 43° cos 20°
A) 0.5(sin (23°) + sin(63°) )
B) 0.5(sin(63°) - sin (23°) )
C) 0.5(cos (23°) + cos(63°) )
D) 0.5(cos (23°) - cos(63°) )
Correct Answer:
Verified
Correct Answer:
Verified
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