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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.
- 2cos⁡(7θ) cos⁡θ2 \cos ( 7 \theta ) \cos \theta


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

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