Re: Problem with Integration
- To: mathgroup at smc.vnet.net
- Subject: [mg22553] Re: [mg22496] Problem with Integration
- From: BobHanlon at aol.com
- Date: Thu, 9 Mar 2000 03:24:35 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
U[f_] := Evaluate[
Integrate[Cos[(f*Pi)/(180*2) + alpha], {alpha, -(Pi/3), Pi/3}]]
?U
"Global`U"
U[f_] := Sqrt[3]*Cos[(f*Pi)/360]
U[60]
3/2
U[60.]
1.5
Bob Hanlon
In a message dated 3/8/2000 4:05:12 AM,
hans.steffani at e-technik.tu-chemnitz.de writes:
>In[1]:= U[f_]:=1.0*Integrate[Cos[(f*Pi)/(180*2) + alpha],{alpha,-(Pi/3),
>Pi/3}]
>
>In[2]:= U[60]
>
> -16
>Out[2]= 1.5 - 6.08617 10 I
>
>In[3]:= Integrate[Cos[(f*Pi)/(180*2) + alpha],{alpha, -(Pi/3), Pi/3}]
>
> f Pi
>Out[3]= Sqrt[3] Cos[----]
> 360
>
>Cos[f Pi/360] should be real vor any real f. How can I avoid results
>like Out[2] (exepct using Chop[] or Re[])?
>