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Write the Product as a Sum or Difference of Trigonometric $2 \cos 8 x \cos 2 x$

Question 259

Multiple Choice

Write the product as a sum or difference of trigonometric functions.
- $2 \cos 8 x \cos 2 x$

A) $\frac { 1 } { 2 } ( \cos 10 x + \cos 6 x )$
B) $\cos 6 x - \cos 10 x$
C) $\sin 10 x + \sin 6 x$
D) $\cos 10 x + \cos 6 x$

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