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Re: real function argument


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
>
>


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