$1x^2+9x-81$
$\left(-6ab+b^2\right)^2$
$mx+1+3mx+1+13mx+1+7mx+1$
$\frac{d}{dx}\left(x\:secx+1\right)$
$m^2+20m$
$\lim_{t\to0}\left(9sin\left(13t\right)ln\left(13t\right)\right)$
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