$0<x^2-2$
$\lim_{x\to0}\left(\frac{1}{2}\right)^x$
$-x^2+13x+12$
$20xy^2-5xy+10x^2y-5x^2y^2$
$\lim_{x\to2}\left(5x\right)$
$\lim_{xt\to0}\left(\frac{1-\cos\left(x\right)}{2t}\right)$
$\int\frac{9}{x+1}dx$
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