− 4 v u 3 + 4 u 3 + 10 v u 2 − 10 u 2 − 10 v u + 10 u + 4 v − 4 {\displaystyle -4vu^{3}+4u^{3}+10vu^{2}-10u^{2}-10vu+10u+4v-4}
