February 21, 2017

Homework Help: analytical geometry

Posted by manjula on Tuesday, January 15, 2013 at 2:06am.

if (l1,m1,n1),(l2,m2,n2),(l3,m3,n3) are the direction cosines of three mutual perpendicular lines,show that the line whose direction ratios area l1+l2+l3,m1+m2+m3,n1+n2+n3 make equal angles with them

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