xexx e^{x}xex
xexx+1\frac{x e^{x}}{x+1}x+1xex
exx+1\frac{e^{x}}{x+1}x+1ex
exln(x+1)\mathrm{e}^{\mathrm{x}} \ln (\mathrm{x}+1)exln(x+1)