Re: Improper Integral & Mathematica

*To*: mathgroup at smc.vnet.net*Subject*: [mg80614] Re: Improper Integral & Mathematica*From*: "Steve Luttrell" <steve at _removemefirst_luttrell.org.uk>*Date*: Sun, 26 Aug 2007 23:18:14 -0400 (EDT)*References*: <faraa2$4k6$1@smc.vnet.net>

Use E rather than e so that Mathematica knows what you mean. Integrate[(E^x)/(1 + E^(2 x)), {x, -Infinity, +Infinity}] Pi/2 -- Steve Luttrell West Malvern, UK <expizzaiolo at gmail.com> wrote in message news:faraa2$4k6$1 at smc.vnet.net... > Hi all ! :-) > > how to solve: > > Integrate[(e^x) / (1 + e^(2x)), {x, - Infinity, + Infinity }] > > using Mathematica? I'm trying "e^x = t" but won't work... > > > > TNX! > >