− u 2 v 4 − 2 u 2 v 3 + 2 u 2 v 2 − 2 u 2 v + u 2 − 2 u v 4 + 5 u v 3 − 5 u v 2 + 5 u v − 2 u + v 4 − 2 v 3 + 2 v 2 − 2 v + 1 u v 2 {\displaystyle -{\frac {u^{2}v^{4}-2u^{2}v^{3}+2u^{2}v^{2}-2u^{2}v+u^{2}-2uv^{4}+5uv^{3}-5uv^{2}+5uv-2u+v^{4}-2v^{3}+2v^{2}-2v+1}{uv^{2}}}}
