$\lim_{x\to-2}\left(\frac{3x^2+21x}{x+2}\right)$
$6^{-6}\cdot6^7$
$\int-3^{4x^3}x^2dx$
$\sqrt[2]{4+\sqrt{15}}\cdot\sqrt{4-\sqrt{15}}$
$\int^2\cos dx$
$\left(\frac{1}{2\:}m+\frac{3}{5}n\right)^3$
$\left(2b-3c\right)^3$
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