Find the rectangular components the unit vector which is: a) in the direction of E @ P(2, 3, -4) if E = (x2 + y2 + z?) (x/Vy2 + z? ax + y/Vx2 + z?) ay + z/Vx2 + y2) b) perpendicular to the plane passing through M (1, -5, 5), N (-2, 4, 0) and Q (2, 3, 4) and having a position x component c) Find the angle between the vectors RMN & RM