Express the Sum or Difference as a Product $\sin 9 x + \sin 3 x$

question 127

Multiple Choice

Express the sum or difference as a product.
- $\sin 9 x + \sin 3 x$

• A) \(2 \sin 6 x \cos 3 x\)
• B) \(2 \cos 6 x \sin 3 x\)
• C) \(2 \sin 6 x \sin 3 x\)
• D) \(2 \sin 12 x\)

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