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Question #143401

Cosθ + Cosn = _____?

Options:

A) -2sin(θ + n/2)sin(θ-n/2)

B) 2cos(θ + n/2)sin(θ-n/2)

C) 2cos(θ + n/2)cos(θ-n/2)

D) None of the Above

Tags: Math

Answer: Cosθ + Cosn = 2cos(θ + n/2)cos(θ-n/2).

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