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