$\lim_{x\to2}\left(\frac{x^2-x-2}{x^2+2x}\right)$
$\frac{d}{dx}y-x-lny=0$
$\frac{x^3+9x^2+19x-5}{x+5}$
$cos^2x+2cosx-3=0$
$100\:\left(1596+38\right)-9\left(72-49+56\right)$
$\frac{dy}{dx}\left(sin\left(9x\right)\right)^{7x}$
$3c\left(b+a\right)-6d\left(b+a\right)$
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