2 v u 4 − 3 v u 3 + 2 u 3 − v 2 u 2 + 3 v u 2 − u 2 + 2 v 2 u − 3 v u + 2 v {\displaystyle 2vu^{4}-3vu^{3}+2u^{3}-v^{2}u^{2}+3vu^{2}-u^{2}+2v^{2}u-3vu+2v}
