$\left(mn+3\right)\left(m-6\right)$
$-3\left(y+2\right)^2-5+6y$
$g-2g$
$\frac{2x^3-5x^2+x-2}{x-1}$
$du=sen\left(2t\right)dt\:$
$x^2-x-56\ge0$
$\frac{d^2}{dx^2}\left(4x^2+7\right)^4$
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