If a line makes angle \( \alpha, \beta \) and \( \gamma \) with the...

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If a line makes angle \( \alpha, \beta \) and \( \gamma \) with the coordinate
P axes respectively, then \( \cos 2 \alpha+\cos 2 \beta+\cos 2 \gamma= \)

W
(1) 2
(2) -1
(3) 1
(4) 3
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