u 5 − v u 4 + u 4 + 4 v u 3 − 4 u 3 − 4 v u 2 + 4 u 2 + v u − u + v {\displaystyle u^{5}-vu^{4}+u^{4}+4vu^{3}-4u^{3}-4vu^{2}+4u^{2}+vu-u+v}
