11 (a) xy(x-y) (x, y)=(0,0) Let f(x,y)= x + y (x, y)=(0,0) 0 Show that f(0,0),...

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11 (a) xy(x-y) (x, y)=(0,0) Let f(x,y)= x + y (x, y)=(0,0) 0 Show that f(0,0), (0,0) (b) Show that the volume of the largest parallelepiped that can be inscribed in the 8abc ellipsoid + + =lis a b b 33 11 (a) xy(x-y) (x, y)=(0,0) Let f(x,y)= x + y (x, y)=(0,0) 0 Show that f(0,0), (0,0) (b) Show that the volume of the largest parallelepiped that can be inscribed in the 8abc ellipsoid + + =lis a b b 33