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Question Number 36745 by prof Abdo imad last updated on 05/Jun/18
solve the d.e  y^(′′) (t) +y(t)=cos(nt)
$${solve}\:{the}\:{d}.{e}\:\:{y}^{''} \left({t}\right)\:+{y}\left({t}\right)={cos}\left({nt}\right) \\ $$

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