/ 2*x \ / x\ log\E + 1/ - 2*atan\E /
log(E^(2*x) + 1) - 2*atan(E^x)
x 2*x 2*e 2*e - -------- + -------- 2*x 2*x 1 + e E + 1
/ 3*x 2*x \ | x 2*e 2*e | x 2*|-1 + 2*e - -------- + --------|*e | 2*x 2*x| \ 1 + e 1 + e / -------------------------------------- 2*x 1 + e
/ 3*x 4*x 2*x 5*x \ | x 12*e 8*e 8*e 8*e | x 2*|-1 + 4*e - -------- - ----------- + -------- + -----------|*e | 2*x 2 2*x 2| | 1 + e / 2*x\ 1 + e / 2*x\ | \ \1 + e / \1 + e / / ------------------------------------------------------------------ 2*x 1 + e