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real function argument

• To: mathgroup at smc.vnet.net
• Subject: [mg73399] real function argument
• From: bar at ANTYSPAM.ap.krakow.pl
• Date: Thu, 15 Feb 2007 05:04:24 -0500 (EST)
• Organization: Akademia Pedagogiczna w Krakowie

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