Re: Integrate Bug

*To*: mathgroup at smc.vnet.net*Subject*: [mg100097] Re: Integrate Bug*From*: lehin.p at gmail.com*Date*: Sat, 23 May 2009 06:33:27 -0400 (EDT)*References*: <gv2jh5$97b$1@smc.vnet.net>

On 21 May, 07:58, Ney Lemke <ney.nle... at gmail.com> wrote: > I am trying to calculate this integral that should be positive.But the > answer is 0. > > In: Integrate[(1)/(z^2 + b^2 + a^2 - 2 z b Sin[\[Theta]] - > 2 a b Cos[\[Theta]])^(1/2), {\[Theta], 0, 2 \[Pi]}, > Assumptions -> {a > 0, b > 0, z > 0}] > > Out:0 > > Anybody have notice a situation like that? > > My platform is MacOSX 10.4 and Mathematica 7. > > Best wishes, Hello, I confirm this bug on Windows XP SP3 with Mathematica 7.0.1. And I can add that in version 5.2 this bug is absent (Mathematica 5.2 returns unevaluated input).

**Follow-Ups**:**Re: Re: Integrate Bug***From:*R Martinez <rm.tech@mac.com>