− 5 u 2 v 2 − 6 u 2 v + 2 u 2 + 5 u v 3 − 9 u v 2 + 5 u v + 2 v 4 − 6 v 3 + 5 v 2 u v 2 {\displaystyle -{\frac {5u^{2}v^{2}-6u^{2}v+2u^{2}+5uv^{3}-9uv^{2}+5uv+2v^{4}-6v^{3}+5v^{2}}{uv^{2}}}}
