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[" EXAMPLE9If "l(1),m(1),n(1);l(2),m(2),...

[" EXAMPLE9If "l_(1),m_(1),n_(1);l_(2),m_(2),n_(2);l_(3),m_(3),n_(3)" are the direction cosines of three mutually perpenhinkl,"],[" lines,prove that the line whose direction cosines are proportional to "l_(1)+l_(2)+l_(3),m_(1)+m_(2)+m_(3)],[n_(1)+n_(2)+n_(3)" makes equal angles with them."],[" SoLUTION It is given that "l_(1),m_(1),n_(1);l_(2),m_(2),n_(2);l_(3),m_(3),n_(3)" are the direction cosines of there "],[" mutually perpendicular lines."]

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