$$\left. \begin{array} { l } { y = 2 x ^ { 3 } } \end{array} \right.$$
$x=\frac{2^{\frac{2}{3}}e^{\frac{2\pi i}{3}}\sqrt[3]{y}}{2}$
$x=\frac{2^{\frac{2}{3}}\sqrt[3]{y}}{2}$
$x=\frac{2^{\frac{2}{3}}e^{\frac{4\pi i}{3}}\sqrt[3]{y}}{2}$
$x=\frac{2^{\frac{2}{3}}\sqrt[3]{y}}{2}$
