Solved

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

Question 309

Multiple Choice

Use a sum-to-product identity to rewrite the expression.
-sin 43° + sin 55°

A) -2 sin 49° sin 6°
B) 2 cos 49° cos 6°
C) 2 sin 49° cos 6°
D) 2 cos 49° sin 6°

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