$\frac{d}{dx}\left(\frac{e^x}{1-e^x}\right)$
$6ab-ab-5ab$
$\left(8x^2+4x+4\right)$
$\left(\frac{2}{3}a^6b^3+11ab^2\right)^2$
$2x+60\:+\:2x-40$
$\int\:\:x^2cos5x^3dx$
$\sqrt[2]{5^{10}}$
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