− u v 5 − 4 u v 4 + 8 u v 3 − 8 u v 2 + 4 u v + 4 v 4 − 8 v 3 + 8 v 2 − 4 v + 1 u v 5 / 2 {\displaystyle -{\frac {uv^{5}-4uv^{4}+8uv^{3}-8uv^{2}+4uv+4v^{4}-8v^{3}+8v^{2}-4v+1}{{\sqrt {u}}v^{5/2}}}}
