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Plot3D[(x^2 + y^2)^3 + 0.001- 4x^2y^2, {x, -1.145, 1.145}, {y, -1.145, 1.145}]
Plot3D[(x^2 + y^2)^3 + 0.001- 4x^2y^2, {x, -1.145, 1.145}, {y, -1.145, 1.145}]
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