Find the points on the ellipse 2m2 + 33/2 =1 where f(x,y) = xy has its extreme values. The points are . (Type an ordered pair. Use a comma to separate answers as needed. Type an exact answer, using radicals as needed.) Find the maximum and the minimum values of f(x,y,z) = 5x 3y + 92 on the sphere x2 + y2 + 22 = 115. The maximum value is D. (Simplify your answer.) The minimum value is D. (Simplify your answer.)