$\frac{1}{3}\sqrt{\:21}-\frac{2}{3}\sqrt{\:3}x\sqrt{\:7}$
$6a^2\:-\:17a\:+\:12$
$\left(8+8\cos2\left(n\right)\right)$
$\left(2a-b+3\right)\left(2a-b+3\right)$
$\left|25\right|$
$\:x\left(b\:+\:7\right)\:+\:y\left(b\:+\:7\right)$
$\int\frac{2x+7}{\left(x+5\right)\left(x+1\right)}dx$
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