4) If f(x,y) = = (x2 + 2y?) +2 and D = (1, -V3), a) Find the derivative of f in the direction of v at (3, 2) b) Graph f showing the point P(3, 2, f(3,2)) and a tangent line at P in the direction of v. 5) Find the absolute maximum and absolute minimum values of f (x, y) = ex-y(x2 + 2yz) and all points (x,y) at which they occur on the set D = {(x, y): x + y' s 4]