− u 2 v 6 − u 2 v 4 + u 2 v 3 + 2 u v 4 − 3 u v 3 + 2 u v 2 + v 3 − v 2 + 1 u v 3 {\displaystyle -{\frac {u^{2}v^{6}-u^{2}v^{4}+u^{2}v^{3}+2uv^{4}-3uv^{3}+2uv^{2}+v^{3}-v^{2}+1}{uv^{3}}}}
