$4+8-5\left(16-20\right)$
$7\sqrt{3}-3\sqrt{3}-3\sqrt{3}$
$\left(1+a^3\right)\left(1+a\right)$
$2^3-7$
$\lim_{x\to0}\left(\frac{sec^2\left(x\right)-\cos\left(x\right)}{x^3}\right)$
$\left(\sqrt{5}x+4y\right)\left(\sqrt{5}x-4y\right)$
$8m^3-64m$
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