Problem with Integrate
- To: mathgroup at smc.vnet.net
- Subject: [mg25974] Problem with Integrate
- From: hans.steffani at e-technik.tu-chemnitz.de (Hans Friedrich Steffani)
- Date: Tue, 14 Nov 2000 03:47:07 -0500 (EST)
- Organization: Chemnitz University of Technology
- Sender: owner-wri-mathgroup at wolfram.com
z Cos[t]/Sqrt[1 + x^2 + y^2 + z^2 - 2x Cos[t] - 2y Sin[t]]
Integrate[%, {t, 0, 2 Pi}]
produces 0 which is not what I expect.
z Cos[t]/Sqrt[1 + x^2 + y^2 + z^2 - 2x Cos[t] - 2y Sin[t]] /. y -> 0
Integrate[%, {t, 0, 2 Pi}] // Simplify
delivers a nonzero result using Elliptic functions. This means that
the first result is wrong?
n[20]:=
$Version
Out[20]=
"4.0 for Linux (July 22, 1999)"
An example file (nb, ps) kann be found at
http://www.tu-chemnitz.de/~hfst/mathematica/integrationprob/
Thanks for help
Hans Friedrich Steffani
--
Hans Friedrich Steffani
Institut fuer Elektrische Maschinen und Antriebe, TU Chemnitz
mailto:hans.steffani at e-technik.tu-chemnitz.de
http://www.tu-chemnitz.de/~hfst/