3. Consider the function ry(x- -y2) H (x , y ) c2+1/2 (x, y) # (0, 0) 0 Otherwise (a) Compute Hx(0, 0) and Hy (0, 0). (b) Compute Hr(x, y) and Hy(x, y) for (x, y) # (0,0). (c) Compute Her (0, 0), Hyy(0, 0), Hry (0, 0), and Hyr (0, 0)