If \( \alpha, \beta, \gamma \) be the angles which a line makes wit...
If \( \alpha, \beta, \gamma \) be the angles which a line makes with the
\( \mathrm{P} \) positive direction of co-ordinate axes, then
W \( \sin ^{2} \alpha+\sin ^{2} \beta+\sin ^{2} \gamma= \)
(1) 2
(2) 1
(3) 3
(4) 0
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