Find the area under f(x)=e−xf(x) = e^{-x}f(x)=e−x from x=0x=0x=0 to x=1x=1x=1.
1−e−11 - e^{-1}1−e−1
e−1−1e^{-1} - 1e−1−1
eee
1−e1 - e1−e