Доказать тоджество:
((x^3+y^3)/(x-y)^2)+(3xy^2-y^3/(y-x)^2)+(3xy^2/2xy-x^2-y^2)=x^3/(x-y)^2
((x^3+y^3)/(x-y)^2)+(3xy^2-y^3/(y-x)^2)+(3xy^2/2xy-x^2-y^2)=x^3/(x-y)^2
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