$4x^2-8x+13$
$\left(sen^2+cosx\right)^4$
$\frac{8b\:-\:12a^4b^3\:-\:6a^5b^2\:+\:10a}{2ab^2}$
$x^2-x-20\ge0$
$\left(-8^0-8^2\right)$
$\int\frac{x^3}{\left(4-2x^4\right)}dx$
$\frac{\left(x+7\right)\left(x-3\right)}{5x+1}$
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