$6z^2+11z+4$
$\int\left(\frac{13}{x^2}\right)dx$
$\frac{d}{dx}sen^2\left(tanx\right)$
$\int\frac{\sin\left(e^x\right)e^x}{\cos\left(e^x\right)}dx$
$\left(\frac{a}{2}-\frac{2}{a}\right)^4$
$\left|-4.5\right|$
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