$\left(9x^{10}y^3\right)\left(-x^5+y^3\right)$
$28nb+7nb-12nb-3nb$
$\left(5+9z\right)\left(5+9z\right)$
$\left(9^2\right)^4$
$\lim_{x\to0}\left(\frac{2\sin\left(x^2\right)}{1-\cos\left(x\right)}\right)$
$a^2-12ax+4,\:si\:a=3\:y\:x=7$
$\left(-3x+7\right)\left(4x-9\right)$
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