6y(x2+y2)3=4x2+y2−x6 y\left(\sqrt{x^{2}+y^{2}}\right)^{3}=4 \sqrt{x^{2}+y^{2}}-x6y(x2+y2)3=4x2+y2−x
3y(x2+y2)3=2x3 y\left(\sqrt{x^{2}+y^{2}}\right)^{3}=2 x3y(x2+y2)3=2x
4y(x2+y2)3=6x2+y2−x4 y\left(\sqrt{x^{2}+y^{2}}\right)^{3}=6 \sqrt{x^{2}+y^{2}}-x4y(x2+y2)3=6x2+y2−x
2y(x2+y2)3=3x2+y22 y\left(\sqrt{x^{2}+y^{2}}\right)^{3}=3 \sqrt{x^{2}+y^{2}}2y(x2+y2)3=3x2+y2