Choose the One Alternative That Best Completes the Statement or Answers

Choose the one alternative that best completes the statement or answers the question.
Express the product as a sum containing only sines or cosines.
- $\cos ( 2 \theta ) \cos ( 4 \theta )$

A) $\frac { 1 } { 2 } [ \cos ( 2 \theta ) + \cos ( 6 \theta ) ]$
B) $\cos ^ { 2 } \left( 6 \theta ^ { 2 } \right)$
C) $\frac { 1 } { 2 } [ \cos ( 6 \theta ) - \cos ( 2 \theta ) ]$
D) $\frac { 1 } { 2 } [ \cos ( 6 \theta ) - \sin ( 2 \theta ) ]$

Correct Answer:

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