MathGroup Archive 1993

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A curious sign error


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[...]).


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