If a vector \( \vec{P} \) make angles \( \alpha, \beta \), and \( \gamma \) respectively with th...

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If a vector \( \vec{P} \) make angles \( \alpha, \beta \), and \( \gamma \) respectively with the \( X, Y \) and \( Z \) axes. Then \( \sin ^{2} \alpha+\sin ^{2} \beta+\sin ^{2} \gamma= \)
[MP PET 2012]
(a) 0
(b) 1
(c) 2
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