Q2. Determine the directional derivative of o = x y? + y z at (2, -1, 1) in the direction of the normal to the surface x log z -y? = -4 at (-1, 2, 1). (5 marks) Q3. Calculate vf when f = 3 x z - 2 yz + 5 x y +2 x 4 y 6 at the point (1,1,0). (5 marks) Q2. Determine the directional derivative of o = x y? + y z at (2, -1, 1) in the direction of the normal to the surface x log z -y? = -4 at (-1, 2, 1). (5 marks) Q3. Calculate vf when f = 3 x z - 2 yz + 5 x y +2 x 4 y 6 at the point (1,1,0). (5 marks) Q2. Determine the directional derivative of o = x y? + y z at (2, -1, 1) in the direction of the normal to the surface x log z -y? = -4 at (-1, 2, 1). (5 marks) Q3. Calculate vf when f = 3 x z - 2 yz + 5 x y +2 x 4 y 6 at the point (1,1,0). (5 marks)