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MathGroup Archive 1996

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Re: solving differential equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg5454] Re: [mg5386] solving differential equations
  • From: Francisco Edmundo de Andrade <edmundo at lia.ufc.br>
  • Date: Sat, 7 Dec 1996 00:26:32 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

On Thu, 5 Dec 1996, Johannes Natterer wrote:

> Hi, 
> 
> when solving differential equations analytically with mathematica,
> I always get the solutions in the form of complex exponential 
> functions and not in the form of the equivalent trigonometric
> functions. Simplify does no good, is there any way to change that?
> 
> Regards,
> 
> Johannes Natterer
> -- 
> 
> ------------------------------------------------------------------------------
> Johannes Natterer
> Institut fuer Physikalische Chemie der Universitaet Bonn
> 
> 

Dear Johannes,

I would solve this problem by using ComplexToTrig[expr] function that is
defined in Trigonometry package.
So, load the package:
  <<Algebra`Trigonometry`
Then, use the function:
  ComplexToTrig[expr]

(* Edmundo's contribuition 1996 *)

With kindest regards.

Edmundo.
-----------------------------
Universidade Federal do Ceara
  Departamento de Computacao
        B R A S I L
    edmundo at lia.ufc.br
-----------------------------



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