$sen^2\left(0\right)$
$1-\left(-1-1\right)$
$\int t\:lm\left(t+1\right)dt$
$\frac{x^2+3x}{x^2-9}$
$\left(-9x+13y\right)+\left(-16y-7x\right)+\left(-9x+13y\right)+\left(-16y-7x\right)$
$6\left(x+2y\right)+3+4y+5$
$y^2=0$
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