(1 point) Let f(x, y) = e5x sin(3y). (a) Using difference quotients with Ax = 0.1 and Ay = 0.1, we estimate fx(2,-1) 2.5209E-5 fy(2,-1) -1.2996E-4 (b) Using difference quotients with Ax = 0.01 and Ay = 0.01, we find better estimates fx(2,-1) 3.1247E-5 f(2,-1) -1.3453E-4