$\frac{1-2-2-3}{3}$
$2x^2+8x-9$
$5ab\:-\:3ab^2+6ab-10ab^2-2ab^2$
$\frac{d}{dx}\:\frac{e^{-x^2}}{x}$
$\left(\frac{a}{3}-\frac{3}{b}\right)^4$
$4x\left(x+3\right)\ge-5$
$\frac{\left(\sec x+1\right)\:\left(\sec\:x-1\right)}{\tan^2x}$
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