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**[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???

- Thread starter hils0005
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- #1

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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

rock.freak667

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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.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???

- #3

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Thanks for the explanation

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