$\left(-r^{-\frac{1}{2}}\right)^4$
$\frac{1}{2}t+\frac{2}{3}t$
$f\left(x\right)=x^{2}\arcsenx^{2}+\frac{1-\sen\left(\pix\right)}{2-\cos\left(\pix\right)}$
$-15+4+1$
$2\left(7x\right)\left(11\right)$
$\left(ax+b\right)\left(cx+\right)$
$x^7y^5+x^4y^3-x^6y^5$
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