$u^2-2u-1$
$\left(\frac{u^{-3}}{z^2}\right)\left(-3x^3u^2z\right)^{-2}$
$3975\cdot100$
$-5h+7-8-2h$
$4-2t>-t-5$
$3xcotx+x^2cscx$
$\lim_{x\to1}\left(\frac{\sqrt{1+\sqrt{x}}-\sqrt{2}}{x-1}\right)$
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