$11-\left(-16\right)$
$b^2-5b+4$
$\sec\left(\arctan\left(\frac{u}{3}\right)\right)$
$2a-2$
$\left(2xy^2\right)^3\left(xy\right)^8$
$\frac{3}{3x+12}$
$\frac{120}{0.2}$
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