− 2 u 3 v 2 − 3 u 3 v + u 3 + 2 u 2 v 3 − 9 u 2 v 2 + 9 u 2 v − 3 u 2 − 3 u v 3 + 9 u v 2 − 9 u v + 2 u + v 3 − 3 v 2 + 2 v u 3 / 2 v 3 / 2 {\displaystyle -{\frac {2u^{3}v^{2}-3u^{3}v+u^{3}+2u^{2}v^{3}-9u^{2}v^{2}+9u^{2}v-3u^{2}-3uv^{3}+9uv^{2}-9uv+2u+v^{3}-3v^{2}+2v}{u^{3/2}v^{3/2}}}}
