$x^2-2x+-2$
$x^4-9^2$
$\lim_{x\to-1}\frac{x^2+8x+7}{x^2+x}$
$\frac{d}{dx}\left(\frac{4x}{\left(x^2+1\right)^2}\right)$
$2\cot^2\left(x\right)-5\cot\left(x\right)+2$
$\frac{\left(x^4+x^3-11x^2+11x-3\right)}{x-3}$
$4a+4b$
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