Express the Product as a Sum Containing Only Sines or Cosines

question 394

Multiple Choice

Express the product as a sum containing only sines or cosines.
- $2 \cos ( 7 \theta ) \cos \theta$

• A) \(\cos ( 10 \theta ) + \sin ( 4 \theta )\)
• B) \(\cos ( 14 \theta ) + \cos ( 2 \theta )\)
• C) \(\cos ( 8 \theta ) + \cos ( 6 \theta )\)
• D) \(\cos ( 8 \theta ) + \sin ( 6 \theta )\)

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