Write the expression in terms of sine and cosine, and simplify so that no quotients appear in the final expression.
-10 cos 26° cos 13°
A) 5(sin 39° - sin 13°)
B) 10(sin 39° + sin 13°)
C) 5(cos 39° - cos 13°)
D) 5(cos 39° + cos 13°)
Correct Answer:
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