The sum of the solutions in(0,2pi) of th...

The sum of the solutions in`(0,2pi)` of the equation `cos x cos(pi/3-x) cos (pi/3+x)=1/4` is

A

`4 pi`

B

`pi`

C

`2 pi`

D

`3 pi`

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The correct Answer is:

C

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