The direction cosines of two lines satisfy `2l+2m-n=0` and `lm+mn+nl=0`. The angle between these lines is

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

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

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

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

If the direction rations 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 satisfying the conditions l + m + n = 0 and 3lm - 5mn + 2nl = 0 where l, m, n are the direction cosines. The value of lm+mn + nl is

The direction cosines of two lines satisfying the conditions l + m + n = 0 and 3lm - 5mn + 2nl = 0 where l, m, n are the direction cosines. The value of lm+mn + nl is