$x^3-125$
$\frac{7}{a}-\frac{3}{a}$
$3x+3y+6$
$sec\:a=-\frac{7}{25}$
$256sen^8x+sen^2x=1$
$\frac{r^6}{r^2}-\:8$
$\left(-e^{\frac{1}{\infty}}\right)-\left(-e^{\frac{1}{1}}\right)$
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