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