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cos (alpha + beta + gamma ) + cos (alpha...

`cos (alpha + beta + gamma ) + cos (alpha - beta - gamma) + cos ( beta - gamma - alpha ) + cos ( gamma - alpha - beta )= `

A

`2 cos alpha cos beta cos gamma `

B

`3 cos alpha cos beta cos gamma `

C

`4 cos alpha cos beta cos gamma `

D

`6 cos alpha cos beta cos gamma `

Text Solution

Verified by Experts

The correct Answer is:
C
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