$\lim_{x\to-1}\left|x\right|$
$\frac{t^{20}}{t^5r^3}$
$-4\left(-6x+18\right)$
$\int\frac{1}{x\left(x^2-16\right)}dx$
$196x^2y^4-225a^8$
$\left(xy^2+z^3a\right)^3$
$\int\frac{1}{\sqrt{\left(x^2-3\right)}}dx$
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