I'm trying to understand this integral.(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\int \frac {x^3 dx}{x^4 + 1}dx\\[/itex]

One possible answer is this formula.

[itex]\int \frac {dx}{x}dx = \ln |x|+ C\\[/itex]

I've seen a couple of other formulas where if [itex]x^2 + a^2[/itex] is a part of the integrand

than trigonometric functions become part of the end formula. There are too many

formulas to choose from.

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# Trouble with this integral

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