Rewrite the expression as an equivalent expression that does not contain powers of trigonometric functions greater than 1.cos3 x
A. 
cos x + 
cos 3x
B. 
cos x - 
cos 3x - cos 2x
C. 
cos x + 
cos 3x + cos 2x
D. 
cos x - 
cos 3x
Answer: A
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Fill in the blank(s) with the appropriate word(s).