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If a line in the space makes angles $\alpha, \beta$ and $\gamma$ with the coordinate axes, then $ \cos 2 \alpha+ \cos 2 \beta+\cos 2 \gamma +\sin ^2 \alpha +\sin ^2 \beta+\sin ^2 \gamma=$

\[\begin {array} {1 1} (1)\;-1 & \quad (2)\;0 \\ (3)\;1 & \quad (4)\;2 \end {array}\]

1 Answer

(3) 1
answered Nov 7, 2013 by pady_1
 

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