$m^3-2m^2n+\:mn^2$
$3\left(17-19\right)$
$\left(m-3\right)^2\left(m-5\right)^2$
$4y+x=4$
$a^2-6a+8$
$\left(8w+z\right)^2$
$\lim_{x\to1}\left(\frac{1-x^2}{sen\:\pi x}\right)$
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