$4^{x-3}=4^{-2}$
$\lim_{xz\to1}\left(\frac{z-1}{z^2-1}\right)$
$\lim_{x\to-4}\left(x-4\right)$
$\cot\left(x-40\right)=1.5$
$343-6x^2-15x-\frac{15}{x}-20$
$\frac{700}{2}$
$\frac{9}{1}+1331g^{3}$
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