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

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

A

`(sqrt3)/(2) cos 3 theta`

B

`3/4 sec ^(3) theta `

C

`3/2 tan ^(3) theta`

D

`3/4 cos 3 theta`

Text Solution

Verified by Experts

The correct Answer is:
D
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