例7.4.1设z=e”sinV,u=xy,v=x+y,求 Oz Bz Ox Oy 解: ∂z Oz Ou Oz Ov Ox Ou Ox Bv Ox =e"sinv.y+e"cosv.1 e*[y.sin(x+y)+cos(x+y)] OzOz Ou,Oz Ov 0y xyxy =e“siny·x+e"cosv.l =e[x.sin(x+y)+cos(x+y)] BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS PRESS 目录上页下页返回结束目录 上页 下页 返回 结束 例7.4.1 设 z e sin v, u xy , v x y , u = = = + , . y z x z 求 解: x z v u = e sin y z v u = e sin x v v z + v u + e cos y v v z + v u + e cos 1 1 z u v x y x y