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OpenStudy (anonymous):
For nonhomogenous linear DE, y''+9y=sin(3x), using method of undetermined coefficients, I get 0 = sin(3x) when plugging in my trial particular solution (Asin3x +Bcos3x). Am I doing this wrong? If not, what do i do next?
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OpenStudy (tkhunny):
This result tells you that you do not have a sufficiently general solution. Add (Cxsin3x +Dxcos3x). If that doesn't help... What shall we try next?
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