$16x^2+24x+12$
$\left(a+2b^3\right)^2$
$\sec^2a+\tan^2a$
$9c+9d^2$
$\lim_{x\to2}\left(\frac{x^2+x+6}{x-2}\right)$
$\frac{4}{2}\frac{\sqrt{3}}{2}$
$x2+14x-33$
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