$3x+9y-x$
$sen^2\left(x\right)-cos^2\left(x\right)=-0,5$
$\left(-13\right)^3$
$4x^2-12x+8>0$
$5xtxt2$
$\left(5z-9\right)^2$
$-7mn-2mn^2-2mn+8$
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