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f x y x 2 + y 2
x 2 + y 2 + a x 2 a 2 x 2 + y 2
x 2 + y 2 + rx 2 r 2 x 2 + y 2
x 2 + y 2 – 1 3 x 2 y 3
2 x + y 3 – 2x + 4 ÷ y para x 0 e y 2 é
f x y x 2 - y 2
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