− 2 u v 4 − 6 u v 3 + 8 u v 2 − 4 u v + u + v 5 − 4 v 4 + 8 v 3 − 6 v 2 + 2 v u v 5 / 2 {\displaystyle -{\frac {2uv^{4}-6uv^{3}+8uv^{2}-4uv+u+v^{5}-4v^{4}+8v^{3}-6v^{2}+2v}{{\sqrt {u}}v^{5/2}}}}
