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

Question 136

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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