Answer
$= \frac{1}{3}\ln|x^{3}+1| + c$
Work Step by Step
Let $u = x^{3} + 1$
$u' = 3x^{2}$
$\frac{du}{dx} = 3x^{2}$
$\frac{du}{3} = x^{2}$
$\frac{1}{3}\int du(u)^{-1}dx$
$= \frac{1}{3}\ln|u| + c$
$= \frac{1}{3}\ln|x^{3}+1| + c$
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