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Re: //N bug, but WHY?

• To: mathgroup at smc.vnet.net
• Subject: [mg58652] Re: //N bug, but WHY?
• From: David Bailey <dave at Remove_Thisdbailey.co.uk>
• Date: Tue, 12 Jul 2005 05:21:35 -0400 (EDT)
• References: <data3n$mec$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hello,

The term Cosh[43Pi/Sqrt[2]] has the value 1.5263010243767756 x 10^41, 
and the rest of the expression has a nearly equal but opposite value - 
so evaluated to machine precision the subtraction leaves just noise. If 
you apply FullSimplify it simplifies your expression to something that 
has only one term - so that presumably yields the correct answer.

David Bailey
http://www.dbaileyconsultancy.co.uk