Challenging integral with exponential functions

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SUMMARY

The integral of the function exp(y*x)*(1+exp(x))^(-n) with respect to x over the interval [-∞, +∞] presents significant challenges. Users suggest exploring clever substitution methods and integration by parts, specifically using the components eyx and dx/(1+ex)^n. The discussion emphasizes the potential for induction arguments and the need for advanced techniques to simplify the integral, particularly focusing on the related integral of e^(yx)/(1+e^x)^(n-1).

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  • Understanding of exponential functions and their properties
  • Familiarity with integration techniques, including integration by parts
  • Knowledge of substitution methods in calculus
  • Basic concepts of induction in mathematical proofs
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  • Research advanced integration techniques for exponential functions
  • Study the method of integration by parts in detail
  • Explore substitution methods for complex integrals
  • Learn about induction arguments in calculus
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Students and mathematicians dealing with complex integrals, particularly those involving exponential functions, as well as educators seeking to enhance their teaching methods in advanced calculus.

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Homework Statement



I'm unable to integrate the following function with respect to x [-inf, +inf]:

Homework Equations



exp(y*x)*(1+exp(x))^(-n)dx

The Attempt at a Solution



I tried to expand the function by distributing the exponent (-n) across the rightmost product, but I don't think its possible. Does a clever substitution method exist?
 
Last edited:
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Indefinite integral?
 
You can try some sort of induction argument. Integration by parts: eyx and dx/(1+ex)n probably gives you something based on the integral of [tex]\frac{e^{yx}}{(1+e^x)^{n-1}}[/tex]
 

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