/ / 4 ___ 4 ___\\ / / 4 ___ 4 ___\\ / /4 ___ 4 ___\\ / /4 ___ 4 ___\\
| | \/ 2 I*\/ 2 || | | \/ 2 I*\/ 2 || | |\/ 2 I*\/ 2 || | |\/ 2 I*\/ 2 ||
|x - y*|- ----- - -------||*|x - y*|- ----- + -------||*|x - y*|----- - -------||*|x - y*|----- + -------||
\ \ 2 2 // \ \ 2 2 // \ \ 2 2 // \ \ 2 2 //
$$\left(x - y \left(- \frac{\sqrt[4]{2}}{2} - \frac{\sqrt[4]{2} i}{2}\right)\right) \left(x - y \left(- \frac{\sqrt[4]{2}}{2} + \frac{\sqrt[4]{2} i}{2}\right)\right) \left(x - y \left(\frac{\sqrt[4]{2}}{2} - \frac{\sqrt[4]{2} i}{2}\right)\right) \left(x - y \left(\frac{\sqrt[4]{2}}{2} + \frac{\sqrt[4]{2} i}{2}\right)\right)$$
(((x - y*(-2^(1/4)/2 - i*2^(1/4)/2))*(x - y*(-2^(1/4)/2 + i*2^(1/4)/2)))*(x - y*(2^(1/4)/2 - i*2^(1/4)/2)))*(x - y*(2^(1/4)/2 + i*2^(1/4)/2))