$36x^2-y^2$
$5\sin\left(x\right)=0$
$-\left|-38\right|$
$sen^2\theta\:\:-\:2sen\theta\:\:+\:1$
$a^2-22a$
$\int\frac{\sqrt{64-x^2}}{6x}dx$
$\left(5a^2-13a-28\right)$
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