$\left(-3\right)\cdot81$
$\frac{\left(5x+1\right)^2}{5x+1}$
$245m^2-320$
$\int x^4e^{z^2}dx$
$\left|e\right|<4$
$secx\:-\:sen^2x.\:secx=\:cosx$
$-9+4-4$
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