2021 )dy+ 2021 +. dx = 0;y (1) = 1 y y ( x O (xy) 2021 = (1+x²021) (1 + v²021) U (xy)2021 (xy)2021 = 2021 – (1+x2021)(1+y2021) O (xy)2021 = (1-x2021,(1-y°021) 1+ x2021) (1– y°021)

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