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

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

A

0

B

1

C

6

D

12

Text Solution

Verified by Experts

The correct Answer is:
C
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