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## Homework Statement

Hello. I have a simple integral here that has been stumping me for the last 30 minutes. It appears that my basic integration skills have gotten very rusty.

## Homework Equations

[tex]\int{x^3}\sqrt{1+x^2}dx[/tex]

## The Attempt at a Solution

I am pretty sure a simple substitution will do, but I have yet to find it. I have tried simplifying the expression various ways, integration by parts, and I have also tried a few substitutions. Any ideas?