The angle between the lines whose does are given by the equation `l^2+m^2-n^2=0,l+m+n=0` is

The angle between the lines whose direction cosines are given by the equatios l^2+m^2-n^2=0, m+n+l=0 is

The angle between the lines whose direction cosines are given by the equatios l^2+m^2-n^2=0, m+n+l=0 is

Find the angle between the lines whose direction cosines are given by the equation l + m + n = 0 and l^2 + m^2 - n^2 = 0.

Find the angle between the lines whose direction cosines are given by the equations: 2l-m+2n=0 mn+nl+lm=0.

Find the angle between the lines whose direction cosines are given by the equations: l-5m+3n=0 7l^2+5m^2-3n^2=0 .

Find the angle between the lines whose direction cosines are given by the equations 3l+m+5n=0,6m n-2n l+5lm=0

Find the angle between the lines whose direction cosines are given by the equations 3l+m+5n=0,6mm-2nl+5l=0

Find the angle between the two lines whose direction cosines are given by the equation l+m+n=0,2l+2m-mn=0

Prove that the acute angle between the lines whose direction cosines are given by the relation l+ m+n=0 and l^2+m^2-n^2=0 and pi/3