A curious sign error
- To: mathgroup at yoda.physics.unc.edu
- Subject: A curious sign error
- From: JWENDEL at isdmnl.wr.usgs.gov
- Date: Wed, 2 Jun 1993 10:56:40 -0700 (PDT)
The integral of (cos t)/(1 + x cos t) from -pi to pi equals 2pi times (1/x)(1 - 1/Sqrt(1-x^2)) for 0 < x < 1. Mma (v. 2.1 on a Mac Quadra) however gives (2pi) (1/x)(1 + 1/Sqrt[...]).