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(derivative (y^3-x^2*y)/((x^2+y^2)^2) )=-2*x*y/(x^2+y^2)^2-(4*(-x^2*y+y^3))*x/(x^2+y^2)^3
(derivative (y^3-x^2*y)/((x^2+y^2)^2) )=-2*x*y/(x^2+y^2)^2-(4*(-x^2*y+y^3))*x/(x^2+y^2)^3
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