$f\left(u\right)=\left(u-\frac{1}{u}\right)^{3\left[\right]}$
$\cos\:^4y\:-sen^4y=\cos\:^2\:y-sen^2y$
$25t^2-104t+116$
$\frac{10x^{7}y^{3}z^{2}}{6x^{-2}y^{5}z^{2}}$
$9x^2+52=-12x$
$729x^9+27$
$\frac{13y^8z^3}{4^5y^5}$
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