$\lim_{x\to2}\frac{2x-x^2}{x-2}$
$\int cot^32t\:dt$
$\int3cos\:\left(\frac{-1+x}{2}\right)dx$
$z^2-17+30$
$\lim_{x\to10}\left(\frac{100}{\left(x-10\right)}\right)$
$\left(a+2\right)\left(a-1\right)$
$\lim_{x\to\pi}\left(\frac{4sinx}{x+cosx+\pi}\right)$
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