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If cos alpha +cos beta+cos gamma = sin a...

If `cos alpha +cos beta+cos gamma = sin alpha+sin beta+sin gamma=0`, then `cos 3 alpha + cos 3 beta + cos 3 gamma` is equal to

A

0

B

`cos(alpha+beta+gamma)`

C

`3cos(alpha+beta+gamma)`

D

`3sin(alpha+beta+gamma)`

Text Solution

Verified by Experts

The correct Answer is:
C
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