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