− 4 u v 3 − 12 u v 2 + 13 u v − 4 u − 4 v 3 + 13 v 2 − 12 v + 4 u v 3 / 2 {\displaystyle -{\frac {4uv^{3}-12uv^{2}+13uv-4u-4v^{3}+13v^{2}-12v+4}{{\sqrt {u}}v^{3/2}}}}
