− 2 u 2 v 3 − 4 u 2 v 2 + 3 u 2 v − u 2 + u v 4 − 6 u v 3 + 9 u v 2 − 6 u v + u − v 4 + 3 v 3 − 4 v 2 + 2 v u v 2 {\displaystyle -{\frac {2u^{2}v^{3}-4u^{2}v^{2}+3u^{2}v-u^{2}+uv^{4}-6uv^{3}+9uv^{2}-6uv+u-v^{4}+3v^{3}-4v^{2}+2v}{uv^{2}}}}
