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Re: real function argument

• To: mathgroup at smc.vnet.net
• Subject: [mg73440] Re: [mg73399] real function argument
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Fri, 16 Feb 2007 01:06:23 -0500 (EST)
• Reply-to: hanlonr at cox.net

f[x_]:=Re[Cos[x]+I Sin[x]];

D[Simplify[f[x],Element[x, Reals]],x]

-Sin[x]


Bob Hanlon

---- 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