MATLAB求隐函数所确定的函数的导数或偏导

1、>> syms x y;

>> df_dx=diff(cos(x+sin(y))-sin(y),x)

df_dx =

-sin(x + sin(y))

>> df_dy=diff(cos(x+sin(y))-sin(y),y)

df_dy =

- cos(y) - sin(x + sin(y))*cos(y)

>> dy_dx=-df_dx/df_dy

dy_dx =

-sin(x + sin(y))/(cos(y) + sin(x + sin(y))*cos(y))

2、>> pretty(dy_dx)

            sin(x + sin(y)) 

  - ------------------------------- 

    cos(y) + sin(x + sin(y)) cos(y)