Express the Product as a Sum or Difference $\cos 3 x \cos 2 x$

question 198

Multiple Choice

Express the product as a sum or difference.
- $\cos 3 x \cos 2 x$

• A) \(\frac { 1 } { 2 } ( \cos x + \cos 5 x )\)
• B) \(\frac { 1 } { 2 } ( \cos 5 x - \sin x )\)
• C) \(\frac { 1 } { 2 } ( \cos 5 x - \cos x )\)
• D) \(\cos ^ { 2 } 6 \mathrm { x } ^ { 2 }\)

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