$\left(2x+1\right)\left(x+2\right)$
$u\:2\:-\:4u\:-\:60$
$\frac{1-\tan\left(\frac{a}{2}\right)^2}{1+\tan\left(\frac{a}{2}\right)^2}$
$\left(x-2\right)\left(x-2\right)^2$
$2n^2-6n^2-108n$
$\left(3x^3-2\right)\left(-4\right)$
$\int_0^{\infty}sen^2\:x\:dx$
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