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$\left(5-\frac{f}{3}\right)^2$
$\frac{20x^3-12x^2-23x-14}{5x+2}$
$\left(a^2x+8b^4\right)^2$
$2\cos\left(\frac{x+y}{2}\right)\sin\left(\frac{x-y}{2}\right)$
$\lim_{x\to2}\left(\frac{4^x-16}{x-2}\right)$
$2a^2-3a+1$
$2x^2-4x=\:1$
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