I'm told to use the method of solving y''+9y=30e^(3ix), but I'm not sure what to do after I find (D-3)(D-3)y=30e^(3ix).
Could I have some help?
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In terms of Laplace Transform the particular integral of... (1)
... is written as... (2)
... so that is... (3)
Alternatively [and is is a not confortable job ...] You can search for function of the type... (4)
... that satisfies (1)...
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