$-23-2\left(-4\right)$
$\int\frac{20x}{\sqrt{5x^2-6}}dx$
$\frac{a^2-11a+18}{a-9}$
$\sec^2x-2\tan x$
$2x^3-3x^2-x+4$
$\left(1x^2+4xy+2y\right)$
$\lim_{x\to3}\left(-5\right)$
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