$\int_0^{sen\left(x+\pi\right)}\left(e^{-t^2}\right)dt$
$x^6\:y^4-z^8$
$\frac{1-2-2-3}{6}$
$\left(\frac{4}{7}y-\frac{2}{7}\right)\left(\frac{4}{7}y+\frac{2}{7}\right)$
$9m^2+18m+9$
$\lim_{x\to2}\left(\frac{x^3-4}{x^2-2x-4}\right)$
$\frac{1}{2}x-2x+8$
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