$\int\frac{4+5x^{2}}{x^{2}\left(x+2\right)^{3}}dx$
$\cot\left(45\right)+\tan\left(45\right)$
$12x^2y^2+xy3$
$3\frac{-8}{-3}$
$2x^2-2x-9=0$
$\frac{e^{-x}}{4-e^{-2x}}$
$\left(\frac{2}{3}m^2+\frac{4}{5}n^3\right)\left(\frac{2}{3}m^3-\frac{3}{10}n^3\right)$
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