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

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If a vector \( \vec{P} \) making angles \( \alpha, \beta \), and \( \gamma \) respectively with the \( X, Y \) and \( Z \) axes respectively. Then \( \sin ^{2} \alpha+\sin ^{2} \beta+\sin ^{2} \gamma= \)
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