$\int\frac{1}{\left(1-x^2\right)^4}dx$
$\int\left(\sqrt{y^2-5}\right)dy$
$x^2-22-121$
$\frac{d}{dx}\log_{3e}\left(x\right)$
$x^2-28x+28$
$\frac{n^2-16}{n+2}$
$\lim_{x\to81}\left(\frac{\sqrt{82-x}-1}{9-\sqrt{x}}\right)$
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