Finding the particular solution of DE

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SUMMARY

The discussion focuses on solving a nonhomogeneous partial differential equation (PDE) represented as U_tt = U_xx + sin(x)sin(t). The method of undetermined coefficients is deemed inapplicable for this problem. Instead, the Fourier Series Method is recommended for finding the particular solution. The approach involves separating variables by stipulating U(x,t) = X(x)T(t) to derive two ordinary differential equations (ODEs).

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I have a nonhomogeneous DE and wants to find the particular solution for Asin(x)sin(t)

Is there any tips in using method of undetermined coefficient to guess the particular solution of this?
 
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Is this a partial differential equation or is one of x and t the dependent variable so that you have a nonlinear equation? In either case "undetermined coefficients" doesn't apply here.
 
the question is asking us to solve this nonhomogeneous problem:

Utt = Uxx + sin(x)sint(t)

and I think in one step of the calculations, we need to find the general solution of sin(x)sin(t) along with the particular solution.

Or is there another way to approach this question?
 
Stipulate that U(x,t)=X(x)T(t). Then you can separate into 2 ODEs.
 
Sorry, I guess I should be more specified.
It asked us to use the Fourier Series Method.
 

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