Can x = a*sinh(t) be used for solving \int (1/((\sqrt{(x^2)+(a^2)}))^(3/2)*dx)?

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Discussion Overview

The discussion revolves around the integral \(\int \left( \frac{1}{\left(\sqrt{x^2 + a^2}\right)^{3/2}}\right) dx\) and the potential substitution methods for solving it. Participants explore various substitution techniques, including trigonometric and hyperbolic functions.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Mathematical reasoning

Main Points Raised

  • One participant mentions solving the integral using the substitution \(x = a \tan(\varphi)\) and inquires about other possible methods.
  • Another participant seeks clarification on the integral's expression, suggesting it may be \(\int (x^2 + a^2)^{-3/4} dx\), but later corrects this to \(\int (x^2 + z^2)^{-3/2} dx\).
  • A participant shares a solution with a different variable \(z\) set to 3, but it is unclear how this relates to the original problem.
  • One participant reiterates their previous substitution and explicitly asks if alternative methods exist for solving the integral.
  • Another participant proposes the substitution \(x = a \sinh(t)\) as a potential method for solving the integral.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best method for solving the integral, with multiple substitution approaches being discussed and no definitive resolution presented.

Contextual Notes

There are unresolved aspects regarding the correct formulation of the integral and the implications of different substitutions, which may affect the approach to solving it.

zahero_2007
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Hi , I solved [itex]\int (1/((\sqrt{(x^2)+(a^2)}))^(3/2)*dx)[/itex] using the substitution x = a*tan([itex]\varphi[/itex] I wonder if there are other methods to solve this problem?
* (2/3) is the power on the radical function
 
Last edited:
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So the problem is
Integral ( x^2 + a^2 ) ^ (-3/4) dx ?

Is that correct ?
 
paulfr said:
So the problem is
Integral ( x^2 + a^2 ) ^ (-3/4) dx ?

Is that correct ?

Integral ( x^2 + z^2 )^(-3/2)dx I'm sorry I wrote the integral wrong in the first post
 
Last edited:
Attached is the solution with z=3
Cheers
 

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Thanks paulfr but I already said that I solved it with the same substitution x=a*tan(u). I'm asking whether another method exist to solve the integral
 

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