Evaluating Integral: Is Function Integrable?

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ee11p1002
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I am unable to Evaluate this integral. Can anyone tell me what is the test we need to perform to tell whether the function is integrable or not:
 
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  • Improper integral from 0 to plus infinity of 1/(x e^(x^2+1/x^2)) dx, written as a typeset equation.
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This function cannot be integrated in terms of elementary functions.
 
Have a look at Liouville's Theorem on Integration in Terms of Elementary Functions if you are interested.
 
There is also something known as the Risch algorithm.
 
There's the ratio test from Calc 2 which might be helpful here.