Question:
$\frac{x}{9-4 x^{2}}$
Solution:
Let $9-4 x^{2}=t$
$\therefore-8 x d x=d t$
$\Rightarrow \int \frac{x}{9-4 x^{2}} d x=\frac{-1}{8} \int \frac{1}{t} d t$
$=\frac{-1}{8} \log |t|+C$
$=\frac{-1}{8} \log \left|9-4 x^{2}\right|+C$
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