Umkehrabbildung/Explizit/(x,y) nach (x+y^2,-y^4-2xy^2-x^2+y^2+x+y)/Aufgabe

Bestimme die Umkehrabbildung zur Abbildung

\mathbb {R} ^{2}\longrightarrow \mathbb {R} ^{2},\,(x,y)\longmapsto (x+y^{2},-y^{4}-2xy^{2}-x^{2}+y^{2}+x+y).

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