$\frac{1m}{2}-2m$
$\lim_{x\to2}\left(\frac{\sqrt{4-x^2}-\left(x-2\right)}{x^2-4}\right)$
$\frac{-x^2+1}{x^2-4}$
$-2-3x\ge2$
$\int\left(8x^2-8\right)^{\left(\frac{3}{2}\right)}dx$
$4\left(1+m^2\right)$
$\frac{x^2-25}{x^2-9x+20}$
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