41. Directional derivatives Consider the function f(x, y) = 2x24y + 10, whose graph is shown in the figure. = a. Fill in the table showing the values of the directional derivative at points (a, b) in the directions given by the unit vectors u, v, and w. |(a,b)=(0,0) (a,b) = (2,0) (a,b) = (1,1) u = () v = (-) w = (-) b. Interpret each of the directional derivatives computed in part (a) at the point (2, 0).