1. Apr 30, 2008 #1

   hils0005

   

   [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???

    

   hils0005, Apr 30, 2008
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3. Apr 30, 2008 #2

   rock.freak667

   

   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.

    

   rock.freak667, Apr 30, 2008
4. Apr 30, 2008 #3

   hils0005

   

   Thanks for the explanation

    

   hils0005, Apr 30, 2008

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