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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?
> 


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