Finding the particular solution of DE

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Discussion Overview

The discussion revolves around finding the particular solution of a nonhomogeneous differential equation involving the term Asin(x)sin(t). Participants explore methods for solving this equation, including the method of undetermined coefficients and the Fourier Series Method.

Discussion Character

  • Technical explanation, Debate/contested, Homework-related

Main Points Raised

  • One participant seeks tips on using the method of undetermined coefficients for the term Asin(x)sin(t).
  • Another participant questions whether the equation is a partial differential equation or if one of the variables is dependent, suggesting that the method of undetermined coefficients may not apply.
  • A participant clarifies that the problem involves solving the nonhomogeneous equation U[SIZE="1"]tt = U[SIZE="1"]xx + sin(x)sin(t) and mentions the need for both the general and particular solutions.
  • Another participant proposes separating variables by stipulating U(x,t)=X(x)T(t) to form two ordinary differential equations.
  • A later reply indicates that the problem specifically requests the use of the Fourier Series Method.

Areas of Agreement / Disagreement

Participants express differing views on the applicability of the method of undetermined coefficients and the appropriate approach to solving the differential equation. No consensus is reached on the best method to use.

Contextual Notes

Participants do not fully resolve the nature of the equation or the assumptions regarding the variables involved, leading to uncertainty about the appropriate methods for solution.

Who May Find This Useful

Students and practitioners interested in differential equations, particularly those involving nonhomogeneous terms and methods of solution such as Fourier Series.

overseastar
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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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