$\left|-41\right|-\:\left|18\right|+12$
$\left(1000-x-10y\right)^2$
$\int\:\frac{2x^3-4x^2-15x}{x^2-2x-8}dx$
$\frac{x}{5xy}$
$\left(9m+7r\right)\left(9m-7r\right)$
$\tan\left(x\right)=\frac{\sqrt{21}}{2}$
$-\frac{m^{2}}{5m^{3}}$
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