Express the Sum or Difference as a Product of Sines $$\cos ( 10 \theta ) - \cos ( 4 \theta )$$

question 370

Multiple Choice

Express the sum or difference as a product of sines and/or cosines.
- $$\cos ( 10 \theta ) - \cos ( 4 \theta )$$

• A) \(2 \cos ( 3 \theta )\)
• B) \(2 \cos ( 7 \theta ) \cos ( 3 \theta )\)
• C) \(- 2 \sin ( 7 \theta ) \sin ( 3 \theta )\)
• D) \(- 2 \cos ( 7 \theta ) \sin ( 3 \theta )\)

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