− 2 v u 3 + 4 u 3 + 8 v u 2 − 11 u 2 − 11 v u + 8 u + 4 v − 2 {\displaystyle -2vu^{3}+4u^{3}+8vu^{2}-11u^{2}-11vu+8u+4v-2}
