$tan\left(x^2+5x\right)$
$a+b-b$
$3xy+5xy-2xy$
$4n^2\:-\:24n\:+\:36$
$a\left(2x-1\right)$
$\left(a+2x\right)\left(2x-3a\right)$
$4+\frac{6}{2}$
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