$\lim_{x\to1}\left(\frac{x^2-x}{x^2+1}\right)$
$4x^3-6y^3$
$3x+7+\frac{2}{x}$
$\int\frac{3}{9+x^2}dx$
$\lim_{x\to0}\left(\frac{1}{x^{-1}}\right)$
$-135:-9$
$-24.37+5.112$
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