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