If \( \alpha, \beta, \gamma \) and the angle which is a directed line makes with the positive di....

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If \( \alpha, \beta, \gamma \) and the angle which is a directed line makes
\( \mathrm{P} \)
with the positive directions of the coordinate axes, then the value \( \sin ^{2} \alpha+\sin ^{2} \beta+\sin ^{2} \gamma \) is
(1) 1
(2) 2
(3) 0
(4) None of these


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