I have an exam in 2 days and Im still getting confused on how to find y(adsbygoogle = window.adsbygoogle || []).push({}); _{p}, the particular solution.

for example

y''+ 4y = 9te^t+ 4

or tsin(2t) + 2

Is it only by guessing and thats it? I still cant answer these questions 100% correctly. I would like to have your advises to find the best way to solve this complicated undertemind coeff.

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# Finding Particular solution

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