Posted by Jayme on Sunday, February 3, 2008 at 8:53pm.
Write a trial solution for the method of indetermined coefficients:
y''+9y' = xe^(x)cos(pi*x)
....I have no idea.

College Calculus  Count Iblis, Monday, February 4, 2008 at 5:24pm
Try to do this problem first
y''+9y' = exp(p x)
Then use that cos(pi x) can be expressed in terms of exponential functions. Also, if you differentiate w.r.t. the parameter p, a factor x will come down on the right hand side of the differential equation.
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