implicitplot((x^2+y^2-4*(x^2-y^2)^2/(x^2+y^2)^(3/2)+4)-(x^2+y^2-3*(x^2-y^2)^2/(x^2+y^2)^(3/2)+2)^2,x=-2.5..2.5,y=-2.5..2.5);

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