• anonymous
what makes this integral improper integral o to - infinity e^(x)/1+e^x
  • Stacey Warren - Expert
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  • katieb
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  • shadowfiend
Hm... Is there a limit in that problem?
  • anonymous
Can you write down the question using the equation box so we can see what it actually looks like. I don't quite understand what you're asking. If you mean this:\[\int\limits_{0}^{\infty} e^x/(1+e^x)\] By definition of an improper integral, if one of the bounds is infinity or negative infinity, it's an improper integral because infinity isn't a real number.

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