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

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

A

0

B

1

C

6

D

12

Text Solution

Verified by Experts

The correct Answer is:
C
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