Problem with antiderivtive of ArcSec

*To*: mathgroup at smc.vnet.net*Subject*: [mg24362] Problem with antiderivtive of ArcSec*From*: heathw at in-tch.com*Date*: Sun, 9 Jul 2000 04:53:04 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Hi, I am trying to integrate the following function: 1/(x*Sqrt[x^2-1]) The solution should be simply: ArcSec[x] Mathmatica gives: -ArcTan[1/Sqrt[x^2-1]] Why won't Mathematica give me the 'textbook' answer? It seems that mathematica gives a solution in terms of ArcTan to any equation like the one I listed. Thanks, Heath