Write the Product as a Sum or Difference of Trigonometric $2 \sin 3 x \sin 18 x$

question 25

Multiple Choice

Write the product as a sum or difference of trigonometric functions.
- $2 \sin 3 x \sin 18 x$

• A) \(\cos 21 x + \cos 15 x\)
• B) \(\sin 21 x + \sin 15 x\)
• C) \(\cos 15 x - \cos 21 x\)
• D) \(\frac { 1 } { 2 } ( \cos 21 x + \cos 15 x )\)

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