$4x^2y^2z^2\:y-2$
$\int\frac{x-4}{x^2+7x+6}dx$
$14-1-1$
$a^210a+25$
$3\left(2a+3\right)\left(2a-3\right)$
$\lim_{x\to\frac{\pi}{4}}\left(\cot x-1\cdot\sec\left(2x\right)\right)$
$a=\left(2m^2+3n^3\right)^2$
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