$\left(cot\theta\:\right)\left(cot\theta\:-tan\theta\:\right)$
$x^2-2x-5$
$\left(\frac{2}{3}x+\frac{1}{4}\right)\left(\frac{2}{3}x-2\right)$
$rs+4st$
$\left(-3+6+18\right):\left(-3\right)$
$\left(x+4\right)^{2}+\left(x+3\right)+x^{2}-3x-9$
$-\frac{32}{-8}$
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