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