$\frac{d}{dx}\frac{2x}{x^2+2}$
$\left(x^my^nc\right)\left(-x^my^nc^y\right)$
$\frac{8}{\left(5x-4\right)\left(5x+4\right)}$
$\lim_{x\to\infty}\:\frac{x^2+2}{x^2+1}$
$15x^2-4x-4$
$2\left(3m+7\right)$
$\frac{d}{dx}\left(e^x\right)\left(x^{\:3}+4\right)$
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