$3cos2x=1$
$\frac{3}{x^2-x-6}$
$4a^2-12ad+9a^2$
$\lim_{x\to0}\left(\sqrt{x}\ln\left(x\right)^2\right)$
$\left(4x-2y\right)\left(x-4\right)$
$2x^2-18x+36$
$\left(x+\frac{2}{5}\right)\left(x-\frac{3}{4}\right)$
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