$3\tan^3x-\tan x=0$
$\lim_{r\to1}\left(\frac{1-r^{n+1}}{1-r}\right)$
$\left(ab^2-5m\right)^2$
$7\left(7n\right)$
$-210-74+58$
$\left(b+2\right)^4$
$\frac{x^3-x^2-5x+7}{x+3}$
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