Question 1. Find the critical points of f(x, y), and use the Second Derivative Test to determine whether they are local minima, local maxima or saddle points. (1) f(x, y) = (x2 - 1 )y. (2) f(x, y) = (x2 - 2x)(y] - 1). Question 2. Find the global maximum and minimum values of f(x,y) = 2xy - x3 + y' + 3x - y on the region D = {(x, y) |0