I'm just curious as to how(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

\int (\frac{1}{1+x^{2}}) dx

[/tex]

comes to be

[tex]

\tan^{-1} (x)

[/tex]

I was able to find the formula on a table of integrals, but I'd just like to know why it works like this, and why we can't use a natural log rule or a substitution method to find this out.

Thanks for reading!

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# Homework Help: Question about Integration

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