− v 2 u 3 + 2 v 2 u 2 − v w 2 u 2 + 2 w 2 u 2 − v u 2 − v 2 w u 2 + 2 v w u 2 − w u 2 − 2 v 2 u + v w 2 u − 2 w 2 u + v u + v 2 w u − 2 v w u + w u + w 2 {\displaystyle -v^{2}u^{3}+2v^{2}u^{2}-vw^{2}u^{2}+2w^{2}u^{2}-vu^{2}-v^{2}wu^{2}+2vwu^{2}-wu^{2}-2v^{2}u+vw^{2}u-2w^{2}u+vu+v^{2}wu-2vwu+wu+w^{2}}
