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

question 254

Multiple Choice

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) \(\cos 11 x + \cos 3 x\)

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