यदि \( \cos ^{-1} \alpha+\cos ^{-1} \beta+\cos ^{-1} \gamma=3 \pi \), तब \( \alpha(\beta+\gamma)...

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यदि \( \cos ^{-1} \alpha+\cos ^{-1} \beta+\cos ^{-1} \gamma=3 \pi \), तब \( \alpha(\beta+\gamma)+\beta(\gamma+\alpha)+\gamma(\alpha+\beta) \) बराबर है
(A) 0
(B) 1
(C) 6
(D) 12
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