Integrate Bug

*To*: mathgroup at smc.vnet.net*Subject*: [mg99983] Integrate Bug*From*: Ney Lemke <ney.nlemke at gmail.com>*Date*: Thu, 21 May 2009 00:05:19 -0400 (EDT)

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,

**Follow-Ups**:**Re: Integrate Bug***From:*peter <plindsay.0@gmail.com>