$\lim_{x\to0}\left(\frac{1-\sqrt[3]{1-x}}{1+\sqrt[3]{3x-1}}\right)$
$\sec\left(x\right)\left(2-\cos\left(x\right)\right)$
$x^2+20x+-100$
$4x+2\ge10$
$\lim_{x\to\sqrt{2}}\left(\frac{x+2}{x-\sqrt{2}}\right)$
$a-22=-31$
$2\left(16-2^2\right)^{\frac{1}{2}}$
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