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The value of cos^3theta+cos^3(theta+120^...

The value of `cos^3theta+cos^3(theta+120^@)+cos^3(theta-120^@)` is

A

`sqrt3/2cos3theta`

B

`3/4sec^3theta`

C

`3/2tan^3theta`

D

`3/4cos3theta`

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