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If cos ^(-1) alpha+cos ^(-1) beta+cos ^(...

If `cos ^(-1) alpha+cos ^(-1) beta+cos ^(-1) gamma=3 pi` then `alpha(beta+gamma)+beta(gamma+alpha)+gamma(alpha+beta)=`

A

0

B

1

C

6

D

12

Text Solution

Verified by Experts

The correct Answer is:
C
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