$\frac{x^3-3}{x^2-1}$
$ax^2+xy-x^2=5$
$\cos^2\left(x\right)=1-\frac{\sqrt{2}}{3}$
$15mn^5+6m^4n^4-12m^2n^2x$
$\lim_{x\to0}\left(\frac{n^2}{2^n}\right)$
$-m\:-m\:-8m\:-7m\:-3m$
$\left|7-\left(6-2\right)\right|-\left(3-11\right)$
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