解:dz/dx=偏z/偏u×偏u/偏x+偏z/偏v×偏v/偏x=(e^u)(cosx)+(-2)(3x^2)=cosx(e^(sinx))-6x^2
du/dx=cosx dv/dx=3x^2dz/dx=e^u*du/dx-2dv/dx=e^u*cosx-6x^2
