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Formel zum Bild "Vierfache Nephroide [Variante II] von Hermann Bauer": [[(x^2+y^2)*(x^2+y^2-a^2)^2-4a²*(x^2+y^2-ax)^2]*[(y^2+x^2)*(y^2+x^2-a^2)^2-4a²*(y^2+x^2-ay)^2]+2048z^12]*[[(x^2+y^2)*(x^2+y^2-a^2)^2-4a²*(x^2+y^2+ax)^2]*[(y^2+x^2)*(y^2+x^2-a^2)^2-4a²*(y^2+x^2+ay)^2]+2048z^12]