$\frac{d}{dx}\frac{-2x}{x^2+5}$
$\frac{x^{11}}{x^{-8}}$
$\int e^{bx}\cos\left(ax\right)dx$
$4\left(8x+1\right)-6\left(1-8x\right)$
$\lim_{x\to-\infty}\left(5-\frac{1}{x}\right)$
$2a^2b+7bxy5$
$\frac{2}{x}=\frac{x}{3}$
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