Solve.Find an equivalent expression for cos3 x in terms of function values of x, 2x, or 3x, raised only to the first power.

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

Mathematics

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