[tex]\int\frac{dx}{x^4+1}[/tex](adsbygoogle = window.adsbygoogle || []).push({});

What really frustrates me is that I've seen this integral before. I believe it involved some whacky subsitution like [tex]x=e^u[/tex], but no substitution seems to work. Partial fractions just make a mess. Trig subs seem tempting but that 4 screws everything up. Ideas?

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# Substitution integral

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