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Write the Product as a Sum or Difference of Trigonometric $2 \sin 4 x \sin 14 x$

Question 137

Multiple Choice

Write the product as a sum or difference of trigonometric functions.
- $2 \sin 4 x \sin 14 x$

A) $\frac { 1 } { 2 } ( \cos 18 x + \cos 10 x )$
B) $\cos 10 x - \cos 18 x$
C) $\sin 18 x + \sin 10 x$
D) $\cos 18 x + \cos 10 x$

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