$\frac{14}{x^2-2x-48}$
$2s^3t-16t^4$
$cos\left(30^{\circ}+x\right)$
$i^{-1}$
$\frac{d}{dx}\frac{-5}{7x-2}$
$\left(m+12\right)\left(m+12\right)$
$0,\:5y''+3y'+9y=0$
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