$\frac{-x^3+x^2-2}{-x^3-x+1}$
$1+2cotx+cot^2x$
$-3^{-2}-3^0$
$\int\frac{2x^2}{x+5}dx$
$\lim_{x\to2}\left(\frac{x^2+4x+4}{x^2-6x+8}\right)$
$-2x+4\le-2$
$\lim_{x\to0}\left(\frac{ln\left(b\right)}{x}\right)$
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