If cos x!+ -1/2, then solutions of cos x...

If `cos x!+ -1/2`, then solutions of `cos x +cos 2x+cos 3x +0` are

A

`2n pi+- pi/4, n in Z`

B

`2 npi +- pi/3, n in Z`

C

`2npi +- pi/6 , n in Z`

D

`2 npi +- pi/2, n in Z`

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The correct Answer is:

A

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