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