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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