求函数y=x+1分子x和函数y=x分之ex次方cosx的导数求大神帮助

1、y=x^2/(x+1),则y'=(2x-x^2)/(x+1)^2=x(2-x)/(x+1)^2 2、y=e^cosx/x,则y'=(-sinx*e^cosx*x-e^cosx)/x^2 =-e^cosx*(xsinx+1)/x^2