Express the Sum or Difference as a Product of Sines $\cos ( 6 \theta ) + \cos ( 4 \theta )$

question 11

Multiple Choice

Express the sum or difference as a product of sines and/or cosines.
- $\cos ( 6 \theta ) + \cos ( 4 \theta )$

• A) \(2 \cos ( 5 \theta ) \sin \theta\)
• B) \(2 \cos ( 5 \theta ) \cos \theta\)
• C) \(2 \cos ( 5 \theta )\)
• D) \(2 \sin ( 5 \theta ) \sin \theta\)

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