$6y^2-22y-8$
$\lim_{x\to1}\left(\frac{\cos\left(x-1\right)}{x}\right)$
$2^{-3}4^2\left(2^34^{-1}-2^24^0+2^7-4^{-2}\right)$
$2x\sqrt{48x^3}-\sqrt{12x^5}$
$20a^2-45$
$\left(x-3.2\right)\left(x-4\right)$
$8ac-12ad-6bc+9bd$
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