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Question Number 68872 by mathmax by abdo last updated on 16/Sep/19
$${solve}\:\:\:\left({x}^{\mathrm{3}} +\mathrm{1}\right){y}^{'} \:+\left(\mathrm{2}{x}+\mathrm{3}\right){y}\:={x}\:{cos}\left(\mathrm{2}{x}\right) \\ $$