The value of the expression cos^3theta+...

The value of the expression `cos^3theta+cos^3(120+theta)+cos^3(240+theta)` is;

A

`cos 3 theta`

B

`1/4 cos 3 theta`

C

`3/4 cos 3 theta`

D

None of these

Verified by Experts

The correct Answer is:

C

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