$\frac{3x^2-2x-8}{x^2+2}$
$\frac{2x^3-x^2+5x}{x}$
$\frac{d}{dx}sin2x-cosx-4x$
$4-b-5b$
$\left(\frac{2x^3}{4y^{-1}}\right)^2$
$\lim_{x\to\:4}\frac{x-4}{3-\sqrt{x+5}}$
$\int x^3\sqrt{x+16}dx$
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