/ x\ acot\E /
acot(E^x)
x -e -------- 2*x 1 + e
/ 2*x \ | 2*e | x |-1 + --------|*e | 2*x| \ 1 + e / ------------------ 2*x 1 + e
/ 4*x 2*x \ | 8*e 8*e | x |-1 - ----------- + --------|*e | 2 2*x| | / 2*x\ 1 + e | \ \1 + e / / -------------------------------- 2*x 1 + e