If \( \alpha, \beta, \gamma \) are the angles which a line makes with the coordinate axes, then....
If \( \alpha, \beta, \gamma \) are the angles which a line makes with the coordinate axes, then
\( \mathrm{P} \)
(1) \( \sin ^{2} \alpha+\cos ^{2} \beta+\cos ^{2} \gamma=0 \)
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(2) \( \cos ^{2} \alpha+\cos ^{2} \beta+\cos ^{2} \gamma=0 \)
(3) \( \cos ^{2} \alpha+\cos ^{2} \beta+\cos ^{2} \gamma=1 \)
(4) \( \sin ^{2} \alpha+\sin ^{2} \beta=1-\cos ^{2} \gamma \)
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