设函数y=y(x)由方程ex+y+cos(xy)=0确定,则dy/dx=_.

问题描述:

设函数y=y(x)由方程ex+y+cos(xy)=0确定,则

dy
dx
=______.

在方程ex+y+cos(xy)=0左右两边同时对x求导,得:
ex+y(1+y′)-sin(xy)•(y+xy′)=0,
化简求得:
y′=

dy
dx
ysin(xy)−ex+y
ex+y−xsin(xy)