$\frac{d^2}{dx^2}\left(xyz\right)$
$74\cdot83$
$-4a-7b+10b+7a$
$\:120-5.5$
$\left(2a-\frac{1}{4}\right)\left(2a+\frac{1}{4}\right)$
$36n^2-66n+121$
$\frac{d}{dx}5.2x-2.3$
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