1.

If three mutually perpendicular lines have direction cosines (l1,m1,n1),(l2,m2,n2) and (l3,m3,n3)line having direction cosines l1+l2+l3,m1+m2+m3 and n1+n2+n3 make an angle of..... with each other

Answer»

If three mutually perpendicular lines have direction cosines (l1,m1,n1),(l2,m2,n2) and (l3,m3,n3)line having direction cosines l1+l2+l3,m1+m2+m3 and n1+n2+n3 make an
angle of
..... with each other




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