Prove that two lines whose direction cosines are given by relation, pl + qm + rn =0 and a(l^2) + b(m^2) + c(n^2) =0 areperpendicular or parallel according as p^2(b+c) + q^2(c+a) + r^2(a+b) =0 or p^2/a + q^2/b r^2/c =0.

Deepansh , 7 Years ago

Grade 12th pass