$z^2-4x^2-y^2=4$
$\frac{2x^3}{2x^2}$
$\sec x\cdot\cot x+\cos x$
$9\:+\:2\left(-1\right)$
$4x-10<x+20$
$\frac{\left(-28\right)}{\left(-28\right)}$
$\lim_{x\to7}\left(v\right)$
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