Write the Product as a Sum or Difference of Trigonometric $2 \cos 7 x \cos 4 x$

Write the product as a sum or difference of trigonometric functions.
- $2 \cos 7 x \cos 4 x$

A) $\sin 11 x + \sin 3 x$
B) $\frac { 1 } { 2 } ( \cos 11 x + \cos 3 x )$
C) $\cos 3 x - \cos 11 x$
D) $\cos 11 x + \cos 3 x$

Correct Answer:

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