If the direction cosines of two lines are such that and

MATHEMATICS · Single correct · CBSE · Mathematics · Three-Dimensional Geometry · Three-Dimensional Geometry

Problem

If the direction cosines of two lines are such that

l+m+n=0

and

l^2+m^2-n^2=0

, then the angle between them is (1)

\pi

(2)

\frac{\pi}{3}

(3)

\frac{\pi}{4}

(4)

\frac{\pi}{6}