यदि cos theta + cos (120^(@) +theta) + c...

यदि `cos theta + cos (120^(@) +theta) + cos (theta -120^(@))= 0` तो `cos^(3)theta + cos^(3) (120^(@) +theta) + cos^(3)(theta -120^(@))` के बराबर है |

A

`(3)/(4) cos theta`

B

`(3)/(4) cos 2theta`

C

`(3)/(4) cos 3 theta`

D

`(3)/(4) sin 3 theta`

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The correct Answer is:

C

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