$\frac{1}{2x}e^{-3x}$
$\int3ve^vdv$
$\frac{-2}{x+5}-\frac{8}{x-2}=8$
$\cos\left(x\right)-\cos\left(2x\right)$
$9r^2+3r-20^2$
$2\left(\frac{1}{5}m-\frac{2}{5}\right)+\frac{3}{5}$
$+571+85$
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