操作方法
>> 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))
>> pretty(dy_dx) sin(x + sin(y)) - ------------------------------- cos(y) + sin(x + sin(y)) cos(y)