Integral quick q , integrate ((1-x)/(1+x))^1/2

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Homework Help Overview

The discussion revolves around the integration of the expression \((\frac{1-x}{1+x})^{\frac{1}{2}}\). Participants are exploring various methods and considerations related to this integral.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Some participants suggest using partial fractions, while others express uncertainty about its applicability due to the nature of the expression. There are considerations of multiplying by forms of 1 to simplify the integral, and references to known integrals involving trigonometric functions are made.

Discussion Status

Participants are actively discussing different approaches, including the potential use of trigonometric substitution and the limitations of partial fraction decomposition for the given integral. There is no explicit consensus, but several productive lines of reasoning are being explored.

Contextual Notes

There are indications that participants are grappling with the definitions and applicability of certain mathematical techniques, such as partial fractions and trigonometric integrals, in the context of the problem.

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Homework Statement



How do I go about integrating
##(\frac{1-x}{1+x})^{\frac{1}{2}} ##?

Homework Equations


above

The Attempt at a Solution


im not really sure.
could integrate by partial fractions if it was to the power of ##1##, only thing i can think of

thanks in advance
 
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What if you multiplied by 1,
i.e.
## 1= \frac{\sqrt{1-x}}{\sqrt{1-x}}##
Then you might have something that looks like a known integral using trig functions.
 
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RUber said:
What if you multiplied by 1,
i.e.
## 1= \frac{\sqrt{1-x}}{\sqrt{1-x}}##
Then you might have something that looks like a known integral using trig functions.

oh thanks, so by doing that I get ##\int \frac{1-x}{(1-x^{2})^{1/2}} dx ##, which I can partial fraction and then integrate
 
I'm not sure if my definition of partial fractions is the same as yours, but
##\int \frac{1}{\sqrt{1 -x^2} }\, dx ## and ##\int \frac{x}{\sqrt{1 -x^2}} \, dx## both have known integrals.
 
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binbagsss] How do I go about integrating ##(\frac{1-x}{1+x})^{\frac{1}{2}} ##? [h2]The Attempt at a Solution[/h2] im not really sure. could integrate by partial fractions if it was to the power of ##1## said:
oh thanks, so by doing that I get ##\int \frac{1-x}{(1-x^{2})^{1/2}} dx ##, which I can partial fraction and then integrate
Partial fractions isn't appropriate here, either. Assuming you could break up ##(\frac{1-x}{1-x^2})^{1/2}## into ##(\frac{A}{1-x} + \frac B {1 + x})^{1/2}##, you still have the sum of the two fractions being raised to the 1/2 power.

Trig substitution is definitely the way to go after applying @RUber's suggestion.
 

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