How to simplify to a result that is real

*To*: mathgroup at smc.vnet.net*Subject*: [mg50679] How to simplify to a result that is real*From*: Richard Chen <richard at doubleprime.com>*Date*: Fri, 17 Sep 2004 01:15:42 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

The command: Integrate[1/(1 + e Cos[t]), {t, 0, a}, Assumptions -> {-1 < e < 1, 0 < a < Pi}] leads to a complex valued result. I could not make mathematica to render the result in a form that is purely real. ComplexExpand, Refine all do not seem to work. Does anyone know how to make mathematica to simplify this result into a real form? Thanks for any info. Richard

**Follow-Ups**:**Re: How to simplify to a result that is real***From:*DrBob <drbob@bigfoot.com>

**Re: How to simplify to a result that is real***From:*Andrzej Kozlowski <andrzej@akikoz.net>