Multiple Choice
Use a product-to-sum identity to rewrite the expression.
-cos(13k) cos (6k)
A) 0.5(cos(7k) - cos(19k) )
B) 0.5(sin(7k) - sin(19k) )
C) 0.5(cos(7k) + cos(19k) )
D) 0.5(sin(7k) + sin(19k) )
Correct Answer:
Verified
Correct Answer:
Verified
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