Find the angle between the lines whose direction-cosines are give / + 2m + 3n = 0 and 3/m - 4/n + mn = 0`

Find the angle between the lines whose direction-cosines are given by : (i) l + m + n = 0, l^(2) + m^(2) - n^(2) = 0 (ii) 2l - m + 2n = 0 , mn + nl + lm = 0 ,

The angle between the lines whose directionn cosines are given by 2l-m+2n=0, lm+mn+nl=0 is

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

An angle between the lines whose direction cosines are given by the equations, 1+ 3m + 5n =0 and 5 lm - 2m n + 6 nl =0, is :

Find the angle between the line whose direction cosines are given by l+m+n=0 and 2l^(2)+2m^(2)-n^(2)-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 vectors whose direction cosines are proportional to 2,3,-6 and 3,-4,5