$\:\:\:-3n\:-\:7n\:+\:11\:-\:2\:\:$
$-2\left(\tan x-1\right)\cdot\left(1-\tan x\right)$
$\frac{8x-6}{x}$
$\frac{3a}{\sqrt{2}+\sqrt{x}}$
$2\cos\left(2x\right)=7\sin\left(x\right)$
$\frac{d}{dx}\left(y=ax^2+bx+c\right)$
$\lim_{x\to0}\left(\frac{x^2}{x-4}\right)$
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