− 2 u 2 v 3 − 2 u 2 v 2 + 2 u 2 v − u 2 + 2 u v 4 − 4 u v 3 + 5 u v 2 − 4 u v + 2 u − v 4 + 2 v 3 − 2 v 2 + 2 v u v 2 {\displaystyle -{\frac {2u^{2}v^{3}-2u^{2}v^{2}+2u^{2}v-u^{2}+2uv^{4}-4uv^{3}+5uv^{2}-4uv+2u-v^{4}+2v^{3}-2v^{2}+2v}{uv^{2}}}}
