$s^2-20s+100$
$\lim_{x\to1}\left(\frac{x^3-1}{x^3-x-1}\right)$
$x^2y+9x^2y-y^2-z$
$5-4y<13-2y$
$-4=\csc\left(\theta\right)$
$\frac{dy}{dx}=3x^2-12x+20$
$-17x^2-340x+2600=81y$
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