Find the equation of the straight line passing (a) (i) through the point `(1,-3, 2)` and is perpendicular to the lines: `(x-1)/1=(y-2)/2=(z-3)/3` and `(x-3)/-3=(y-2)/2=(z-1)/5` (ii) through the point `(2, 3,-1)` and is perpendicular to the lines: `(x-2)/2=(y+1)/1=(z-3)/-3` and `(x-3)/1=(y+2)/1=(z-1)/1` (b) through the point `(2,-1, 3)` and perpendicular to the lines: `vec r=(hati-hatj+hatk)+lambda(2hati+hatj-3hatk)` and `vec r=(hati+hatj-hatk)+mu(hati+hatj+hatk)`.