$-2a-a$
$taga\:sena\:=\:seca\:-\:cosa$
$\left(\frac{3y^2}{4x^5y^4}\right)^2$
$3m^2\cdot\left(5m-7n\right)-3m\cdot\left(2m^2+4n\right)$
$\left(-8x^2y\right)^2\left(7xy^3\right)$
$\frac{x^3+1}{1+x^2}$
$\left(\sqrt[2]{42}\right)^{12}$
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