Question Number 33208 by abdo imad last updated on 12/Apr/18
$${solve}\:{the}\:{d}.{e}.\:{x}^{''} \left({t}\right)\:+\mathrm{3}{x}^{'} \left({t}\right)\:+\mathrm{2}\:{x}\left({t}\right)\:=\:\frac{\mathrm{1}}{\mathrm{1}+{e}^{{t}} } \\ $$
solve-the-d-e-x-t-3x-t-2-x-t-1-1-e-t-