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

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If \( \cos ^{-1} \alpha+\cos ^{-1} \beta+\cos ^{-1} \gamma=3 \pi \), then find the
\( \mathrm{P} \)
value of \( \frac{\alpha^{2}+\beta^{2}+\gamma^{2}}{3} \)
W
(1) \( \frac{1}{3} \)
(2) -1
(3) 1
(4) \( \frac{-1}{3} \)
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