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cos ^3 A + cos^3 (120 +A ) + cos ^3 (12...

`cos ^3 A + cos^3 (120 +A ) + cos ^3 (120 - A) ` is

A

`0`

B

`cos 3A `

C

`3/4 cos 3A `

D

`4/3 cos 3A `

Text Solution

Verified by Experts

The correct Answer is:
C
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