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

question 31

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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