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