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. 1B. 2C. 3D. 4

Answer» Correct Answer - A
If line ` vec(OR)` makes angle ` 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)=1 `


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