Use the Sum-To-Product Formulas to Rewrite the Sum or Difference $$\sin 9 \theta + \sin 7 \theta$$

question 18

Multiple Choice

Use the sum-to-product formulas to rewrite the sum or difference as a product.​ $$\sin 9 \theta + \sin 7 \theta$$ ​

• A)​ \(2 \sin 8 \theta \sin \theta\)
• B)​ \(2 \cos 8 \theta \cos \theta\)
• C)​ \(2 \sin 8 \theta \cos \theta\) ​
• D)​ \(2 \cos 8 \theta \sin \theta\)
• E)​ \(2 \sin 9 \theta \cos 7 \theta\)

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