Solved

Simplify the Expression Algebraically $\cos ( 6 x + 9 y ) + \cos ( 6 x - 9 y )$

Question 23

Multiple Choice

Simplify the expression algebraically. $\cos ( 6 x + 9 y ) + \cos ( 6 x - 9 y )$

A) $\cos 6 x$
B) $\cos 6 x \cos 9 y$
C) $2 \cos 6 x \cos 9 y$
D) $2 \cos 6 x$
E) $2 \cos x \cos y$

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