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Re: real function argument

• To: mathgroup at smc.vnet.net
• Subject: [mg73419] Re: real function argument
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Fri, 16 Feb 2007 00:54:54 -0500 (EST)
• Organization: Uni Leipzig
• References: <er1bq1$7ci$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de

Hi,

f[x_] := Assuming[x =E2=88=88 Reals, Simplify[Re[Cos[x] + I Sin[x]]]]
??

Regards
   Jens
bar at ANTYSPAM.ap.krakow.pl wrote:
> Hi,
> I have a problrm with defining real argument
>
> In:   f[x_]:=Re[Cos[x]+I Sin[x]]
> 	f'[x]
>
> Out:  -Cos[x] Im'[x]-Sin[x]Re'[x]
>
> In: FullSimplify[f'[x],Element[x,Reals]]
> gives the same out
>
> Any suggestions ?
>
> Regards, Olaf
>
>