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MathGroup Archive 2007

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Re: Improper Integral & Mathematica

  • To: mathgroup at
  • Subject: [mg80622] Re: Improper Integral & Mathematica
  • From: Bill Rowe <readnewsciv at>
  • Date: Sun, 26 Aug 2007 23:22:28 -0400 (EDT)

On 8/26/07 at 3:11 AM, expizzaiolo at wrote:

>how to solve:

>Integrate[(e^x) / (1 + e^(2x)), {x, - Infinity, + Infinity }]

>using Mathematica? I'm trying "e^x = t" but won't work...

I am going to assume that you really mean

Integrate[Exp[x]/(!+exp[2 x],{x,-Infinitu, Infinity}] or

Integrate[(eEx) / (1 + E^(2x)), {x, -Infinity, Infinity}]

rather than what you posted. If so,

In[4]:= Integrate[Exp[x]/(1 + Exp[2*x]), {x, -Infinity, Infinity}]

Out[4]= Pi/2

In[5]:= $Version

Out[5]= 6.0 for Mac OS X PowerPC (32-bit) (June 19, 2007)
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