$\lim_{x\to1}\left(x^{17}-3x-1\right)$
$\sqrt{x^9}\cdot x^4$
$\lim_{x\to0}\left(\frac{5e^x-e^{-x}}{x^2}\right)$
$4x^2+15x+20$
$\csc^4-2\csc^2+1=\cot^4$
$m^2-11+30$
$|\:-39\:|$
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