2 u 2 v 4 − 6 u 2 v 3 + 6 u 2 v 2 − 2 u 2 v − 2 u v 4 + 8 u v 3 − 13 u v 2 + 8 u v − 2 u − 2 v 3 + 6 v 2 − 6 v + 2 u v 2 {\displaystyle {\frac {2u^{2}v^{4}-6u^{2}v^{3}+6u^{2}v^{2}-2u^{2}v-2uv^{4}+8uv^{3}-13uv^{2}+8uv-2u-2v^{3}+6v^{2}-6v+2}{uv^{2}}}}
