z对x的偏导
= z对u的偏导除以x对u的偏导+z对v的偏导除以x对v的偏导
= -e^-u u Csc[v] + e^-u v Sec[v]
z对y的偏导
= z对u的偏导除以y对u的偏导+z对v的偏导除以y对v的偏导
= e^-u v Csc[v] + e^-u u Sec[v]
z对x的偏导
= z对u的偏导除以x对u的偏导+z对v的偏导除以x对v的偏导
= -e^-u u Csc[v] + e^-u v Sec[v]
z对y的偏导
= z对u的偏导除以y对u的偏导+z对v的偏导除以y对v的偏导
= e^-u v Csc[v] + e^-u u Sec[v]