$4x^2-4x-24$
$\left(x^2\:+\:4\right)^2$
$\int\frac{2x-11}{x^2+\left(x+2\right)}dx$
$ab+4ab$
$\lim_{x\to6}\left(\frac{-4+3e^{12-2x}}{x^2-36}\right)$
$a+1\:\cdot\:a+2$
$\sqrt[9]{x^{12}}$
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