$\left(\frac{1}{2x}-27\right)$
$-4x^3\cdot2x$
$\frac{2a^3+8a^2+3a}{4a^2+6}$
$x+7>8$
$\int_{\frac{\pi}{6}}^{\frac{\pi}{2}}2cot^2\left(x\right)dx$
$\lim_{x\to10}\left(x^2-6x-9\right)$
$27\:\left(+3\right)$
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