$12-\left(-13\right)$
$-11w^2-1^2$
$1331x^3+8\le0$
$2x^6.6y.4y^2x^6$
$\:\frac{2x^4-5x^3}{x^2-y^3}$
$\lim_{b\to2}\left(\frac{3b}{\sqrt{3b+3}-1}\right)$
$y'=\frac{e^{y^2}}{y}$
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