$-x^2+4x+12$
$\ln\left(\frac{\sqrt{fz}}{z^9}\right)$
$\int_0^{2\pi}\frac{-1}{2-cos2x}dx$
$\lim_{x\to3}\left(\frac{1}{x-1\left(lnx\right)}\right)$
$-2-3-\left(2+\left(-3\right)\right)$
$\lim_{x\to0}\left(\frac{e^x}{x^{2x}-1}\right)$
$800-50$
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