$\left(3x^2+5y^5\right)^3$
$2c+8c$
$18bc^2+24b^2c$
$\left(18\:\cdot2100\right)\:+\:\left(24\:\cdot2000\right)$
$\lim_{x\to2}\left(\frac{\sqrt{x^2-4}}{x^2-4}\right)$
$\frac{900x^2-1600y^2}{40y+30x}$
$\frac{2}{3}y^3-6y$
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