If the line `vec(OR)` makes angles ` theta_(1),theta_(2),theta_(3)` wi – InterviewSolution

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1.	If the line `vec(OR)` makes angles ` theta_(1),theta_(2),theta_(3)` with the planes ` XOY, YOZ, ZOX` respectively , then ` cos^(2)theta_(1)+cos^(2)theta_(2)+cos^(2)theta_(3)` is equal toA. `-1`B. 0C. 1D. 2
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