Integrate?
- To: <mathgroup at yoda.ncsa.uiuc.edu>
- Subject: Integrate?
- From: Robert Staerk <staerk at iam.unibe.ch>
- Date: 31 Oct 90 13:41 +0100
Mathematica gives a wrong answer to the following integral: 2 Pi / | 1/2 | (2 - 2 cos(x)) dx | / 0 Is this a known bug? idefix> math Mathematica (sun4) 1.2 (August 22, 1989) [With pre-loaded data] by S. Wolfram, D. Grayson, R. Maeder, H. Cejtin, S. Omohundro, D. Ballman and J. Keiper with I. Rivin and D. Withoff Copyright 1988,1989 Wolfram Research Inc. -- Terminal graphics initialized -- In[1]:= Integrate[ Sqrt[2 - 2 Cos[x]], {x, 0, 2 Pi}] Out[1]= 0 In[2]:= NIntegrate[ Sqrt[2 - 2 Cos[x]], {x, 0, 2 Pi}] Out[2]= 8. In[3]:= Quit idefix> maple |\^/| MAPLE V ._|\| |/|_. Copyright (c) 1981-1990 by the University of Waterloo. \ MAPLE / All rights reserved. MAPLE is a registered trademark of <____ ____> Waterloo Maple Software. | Type ? for help. > int( sqrt(2 - 2 * cos(x)), x=0...2*Pi ); 8 > done bytes used=1447572, alloc=917336, time=8.116 idefix> ------------------------------------------------------------------------- Robert Staerk (St\"ark) | Laenggassstrasse 51 | Phone: +41 31 65 85 58 Institut fuer Informatik | CH-3012 Bern | Fax: +41 31 65 39 65 und angewandte Mathematik | Switzerland | <staerk at iam.unibe.ch> -------------------------------------------------------------------------