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