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

Question 370

Multiple Choice

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


A) 2cos⁡(3θ) 2 \cos ( 3 \theta )
B) 2cos⁡(7θ) cos⁡(3θ) 2 \cos ( 7 \theta ) \cos ( 3 \theta )
C) −2sin⁡(7θ) sin⁡(3θ) - 2 \sin ( 7 \theta ) \sin ( 3 \theta )
D) −2cos⁡(7θ) sin⁡(3θ) - 2 \cos ( 7 \theta ) \sin ( 3 \theta )

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