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anonymous

  • 5 years ago

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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  1. anonymous
    • 5 years ago
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    never mind, i realized my problem

  2. anonymous
    • 5 years ago
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    So you multiplied your trial solution by x and went through the motions? Did you get a particular solution of \[y=-\frac{1}{6}x \cos 3 x\]?

  3. anonymous
    • 5 years ago
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    yes, that's what i got. thanks!

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