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) \(\cos 18 x + \cos 10 x\)