Re: integration

*To*: mathgroup at smc.vnet.net*Subject*: [mg95968] Re: integration*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Sat, 31 Jan 2009 01:12:48 -0500 (EST)*References*: <glvkh7$e73$1@smc.vnet.net>

Hi, it is a general problem with your mathematical knowledge but reading http://functions.wolfram.com/ElementaryFunctions/ArcCosh/02/ may help. Regards Jens t.p.nixon at open.ac.uk wrote: > Hi, I don't use mathematica but the other day I wanted to solve an > integral and I'm out of practice so I went on-line to a mathematica > based integrator. > > http://integrals.wolfram.com/index.jsp > > I typed in 1/sqrt(x^2-b^2) this should have an integral of cosh^-1(x/ > b). Ok, so it didn't recognize cosh but its answer was (I think) > wrong. it comes back with ln(x+sqrt(x^2-b^2)) it seems to have > overlooked a quotient of b in the log. > > Is this a general problem with mathematica or just the on-line version > or is it me? >