$x^4+6x^3+3x+140$
$\int\frac{2x^2-4}{\left(x^3-4x^2+x+6\right)}dx$
$36x^2-432x+972\:$
$3x+2y+8x^2+9x+6x^2-9y$
$16x-x$
$\lim_{x\to-2}\left(\frac{x^2-2x}{x+2}\right)$
$\frac{x^2-9x+20}{x^2+x-20}$
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