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(Methods)Parameters v Undetermined Coefficients

  1. Apr 30, 2008 #1
    [SOLVED] (Methods)Parameters v Undetermined Coefficients

    Can anyone tell me why I would use one technique over the other? It seems as though undetermined Coef. is much easier to do but I suppose that comes with limitations???
  2. jcsd
  3. Apr 30, 2008 #2


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    Homework Helper

    Well if you can guess the particular integral of a Diff eq'n then method of undetermined coefficients will work and the pi's you can usually guess are usually [itex]e^{ax},sinax,cosax,sinax+cosax,etc.[/itex]. But if you have tanx or [itex]\frac{1}{1+x}[/itex] then you'll need to use variation of parameters to solve.
  4. Apr 30, 2008 #3
    Thanks for the explanation
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