Use the Sum-To-Product Formulas to Rewrite the Sum or Difference $\cos 12 \theta + \cos 8 \theta$

question 188

Multiple Choice

Use the sum-to-product formulas to rewrite the sum or difference as a product. $\cos 12 \theta + \cos 8 \theta$

• A) \(2 \sin 10 \theta \cos 2 \theta\)
• B) \(2 \cos 10 \theta \sin 2 \theta\)
• C) \(2 \sin 12 \theta \cos 8 \theta\)
• D) \(2 \cos 10 \theta \cos 2 \theta\)
• E) \(2 \sin 10 \theta \sin 2 \theta\)

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