- To: mathgroup at smc.vnet.net
- Subject: [mg95952] integration
- From: t.p.nixon at open.ac.uk
- Date: Fri, 30 Jan 2009 05:47:06 -0500 (EST)
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?