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[" 2.The direction cosines of a line equ...

[" 2.The direction cosines of a line equally inclined "],[" to three mutually perpendicular lines having "],[" direction cosines as "l_(1),m_(1),n_(1);l_(2),m_(2),n_(2)" and "l_(3)],[m_(3),n_(3)" are "],[[" (a) "l_(1)+l_(2)+l_(3),,m_(1)+m_(2)+m_(3)],[" (c) "(l_(1)+l_(2)+l_(3))/(3),,(m_(1)+m_(2)+m_(3))/(3),(n_(1)+n_(2)+n_(3))/(3)],[" (d) none of these "]]

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