$x^2-22x-71$
$\frac{1}{-\tan x-\cot x}$
$\left(q^4-q^{\right})^2\right)$
$\frac{3}{\:s\left(s^3+2s^2+2s+1\right)}$
$4x\le-10$
$\lim_{x\to\infty}\left(\frac{x^3senx}{\left(secx-cosx\right)^2}\right)$
$\lim_{x\to\infty}\frac{16x^2-8x+2}{\left(45x^3-5x\right)}$
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