The dir cosines of two lines are related by l+m+n=0 & a(l)^2+b(m)^2+c(n)^2 = 0. the lines are parallel if(find relation b/w a,b,c)
The dir cosines of two lines are related by l+m+n=0 & a(l)^2+b(m)^2+c(n)^2 = 0. the lines are parallel if
(find relation b/w a,b,c)