$\lim_{x\to2}\left(\frac{\sqrt{x^2-4}}{x+2}\right)$
$\log xyz-\log x+\log y$
$2x^3+7xy-4xy^2$
$\int2x^2ln\left(x\right)dx$
$x^2-15x\:+8\:=0$
$4x^2-x+1+-6x^2+x-4$
$y'-3y=e^{-2x}$
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