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Re: real function argument

bar at 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 ?

You can try

FullSimplify[f[x], Element[x,Reals]]

Then take the derivative of the result.

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