The direction cosines l, m and n of two lines are connected by the relations `l+m+n=0 and lm=0`, then the angle between the lines is

If the direction cosines of two lines are connected by the equations l+m+n=0 and l^(2) + m^(2) -n^(2)=0 , then the angle between these lines is of measure

The direction cosines of two lines are connected by relation l+m+n=0 and 4l is the harmonic mean between m and n. Then,

Find the direction colatines of the lines, connected by the relations: l+m+n=0 and 2lm+2ln-mn=0.

Find the direction cosines l + m + n of the two lines which are connected by the relation l+ m + n = 0 and mn – 2nl –2lm = 0.

If the direction ratio of two lines are given by 3lm-4ln+mn=0 and l+2m+3n=0 , then the angle between the lines, is

The direction cosines of two lines are given by the equations 3m+n+5l=0, 6nl-2lm+5mn=0. find the angle between them