Determining when an integral converges or diverges

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SUMMARY

The integral \(\int_0^1\sqrt{\frac{(1+x)}{(1-x)}}dx\) converges. The key to determining convergence lies in analyzing the behavior of the integrand near its singular point, specifically as \(x\) approaches 1. The numerator approaches 2, while the denominator approaches zero, leading to a comparison with the integral of \(1/\sqrt{y}\) near zero, which is known to converge. Thus, the integral converges based on this analysis.

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Homework Statement


determine whether the integral converges or diverges:
\int_0^1\!\sqrt{\frac{(1+x)}{(1-x)}}dx

Homework Equations



I know what if the value is a finite number, it converges, otherwise it diverges. Teacher was was able to determine the fact just by looking at it... what is the procedure for this?
 
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You look near the point where the integrand is singular, in this case near x=1. The numerator is ~2 and the denominator (1-x)=y is near zero. So the integral is going to have the same convergence properties as the integral of 1/sqrt(y) around zero. It converges.
 

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