− 4 v u 3 + 4 u 3 + 11 v u 2 − 11 u 2 − 11 v u + 11 u + 4 v − 4 {\displaystyle -4vu^{3}+4u^{3}+11vu^{2}-11u^{2}-11vu+11u+4v-4}
