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When using the method of undetermined coefficients to solve

2y'' + y' = cos(2x) + 4x + 1

I did it term by term. I figured out the first yp1 for the cos(2x). I'm just not sure what to "guess" as to the form of the yp2 for 4x+1

Does anyone know what to use as the guess?

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# Method of undetermined coefficients

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