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

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

If the direction cosines of two lines are given by l+m+n=0 " and " l^(2)-5m^(2)+n^(2)=0 then the angle between them is

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

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

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 d.c's (l,m,n) of two lines are connected by the relations 3l+m+5n=0, 6mn - 2nl + 5lm=0 then the angle between the lines is