Chapter 13.2, Problem 87E

Two integrals to one Draw the regions of integration and write the following integrals as a single iterated integral:

${\displaystyle {\int }_0^1{\displaystyle {\int }_{e^y}^{e}f\left(x,y\right)dxdy}}+{\displaystyle {\int }_{-1}^0{\displaystyle {\int }_{e^{-y}}^{e}f\left(x,y\right)dxdy}}.$