Преобразуйте в многочлен стандартного вида 2ху+х^2-(х+у)^2
2ху+х^2-(х+у)^2=2xy+x^2-x^2-2xy-y^2=-y^2
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2ху+х^2-(х+у)^2=2xy+x^2-x^2-2xy-y^2=-y^2