Answer
$\frac{1}{4(1-x^2)^2}+C$
Work Step by Step
let $1-x^2=u$
$du=-2x$ $dx$
$\int \frac{x}{(1-x^2)^3}dx$
$=\frac{1}{2} \int \frac{1}{u^3}du$
$=-\frac{!}{2}(-\frac{1}{2}u^{-2})+C$
$=\frac{1}{4(1-x^2)^2}+C$
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