$6^4.2^4$
$\lim_{x\to-6}\left(\frac{x^4-x^3}{x^2}\right)$
$c^2-25$
$4\sqrt{8}-2\sqrt{18}$
$\:5x\:+\:7<\:2x\:-\:4\:$
$\frac{dy}{dx}=\sqrt{3x-23}$
$\left(4y^2+9y-1\right)\cdot\left(5y\right)$
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