v 2 u 3 − 2 v u 3 + u 3 − v 2 u 2 + 3 v u 2 − u 2 − v 3 u + 3 v 2 u − v u + v 3 − 2 v 2 + v {\displaystyle v^{2}u^{3}-2vu^{3}+u^{3}-v^{2}u^{2}+3vu^{2}-u^{2}-v^{3}u+3v^{2}u-vu+v^{3}-2v^{2}+v}
