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