f x, y 0 xy x 2 xy y 2 if if x, y 0, 0 x, y 0, 0 hx, y t f x
Chapter 14, Problem 38(choose chapter or problem)
f x, y 0 xy x 2 xy y 2 if if x, y 0, 0 x, y 0, 0 hx, y t f x,
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