tion 6 of 6 At each of the points (13, 2), (5, -10), (4, 4), evaluate the function h (x, y) = Vx-y x-y or indicate that the function is udefined there. (Use symbolic notation and fractions where needed. If the function is undefined at the given point, type UNDEFINED.) h (13,2) = h (5,-10) = h ( 4 4 ) =