Find the angle between the lines whose direction cosines are connected by the relations `l+m+n=0a n d2lm+2n l-m n=0.`

Find the angle between the lines whose direction cosines are connected by the relations l+m+n=0a n d2//m+2n l-m n=0.

Find the angle between the lines whose direction cosines are connected by the relations l+m+n=0and2lm+2nl-mn=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: 2l-m+2n=0 mn+nl+lm=0.

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

Find the angle between the lines whose direction cosines have the relations l+m+n=0 and 2l^(2)+2m^(2)-n^(2)=0 .