Re: Problem: Integrate

*To*: mathgroup at smc.vnet.net*Subject*: [mg33619] Re: [mg33589] Problem: Integrate*From*: BobHanlon at aol.com*Date*: Wed, 3 Apr 2002 18:08:27 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

In a message dated 4/3/02 1:44:11 AM, abaehr at srt.tu-darmstadt.de writes: >for >Integrate[ -1 + Cos[\[Theta]]\^2 + Sin[\[Theta]]\^2, >\ {\[Theta], 0, 2 \[Pi]}] > >I get the result > >ComplexInfinity > >though the result is obviously zero. The Calculation is OK if I remove >one of the three terms, such that the result is no longer zero. > >Is this a bug? > I get the same error. Whenever a problem arises, one workaround that frequently helps is to Simplify (or FullSimplify) expressions prior to the operation that is causing a problem. $Version 4.1 for Mac OS X (November 5, 2001) Integrate[Simplify[-1 + Cos[th]^2 + Sin[th]^2], {th, 0, 2*Pi}] 0 Bob Hanlon Chantilly, VA USA