Vector \( \overrightarrow{\mathrm{P}} \) makes angles \( \alpha, \beta \& \gamma \) with the \( ...

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Vector \( \overrightarrow{\mathrm{P}} \) makes angles \( \alpha, \beta \& \gamma \) with the \( \mathrm{X}, \mathrm{Y} \) and Zaxes respectively, then \( \sin ^{2} \alpha+\sin ^{2} \beta+\sin ^{2} \gamma= \)
(1) 0
(2) 1
(3) 2
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