5. Suppose z is a function of x and y, and ex sinz + e cos z = 0. Solve for az Oz ax and ay 4 6. The temperature at a point (x, y, z) on the coordinate space is given by f (x, y, z) = x2+y2+22+1 a. Determine the direction of the greatest change in temperature at the point (1,1,1). b. At the point (1,1,1), determine whether the temperature is ascending or descending in the direction (2, -1,2)