I know how to solve the following ODE with variation of parameters:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]y''+4y=4\sec{\left(2t\right)}.[/tex]

Is there any way to solve this with undetermined coefficients? So far I have tried Y_{p}=Acos(2t)+Bsin(2t), but that didn't work.

Thanks for the help.

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# Homework Help: Undetermined Coefficients / Variation of Parameters

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