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Hyperbolic function identity

• To: mathgroup at smc.vnet.net
• Subject: [mg50932] Hyperbolic function identity
• From: carlos at colorado.edu (Carlos Felippa)
• Date: Tue, 28 Sep 2004 00:58:52 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Why 

   FullSimplify[ArcCosh[1+z^2/2]-2*ArcSinh[z/2],z>0];

does not evaluate to 0?

• Follow-Ups:
  • Re: Hyperbolic function identity
    • From: "Maxim A. Dubinnyi" <maxim@nmr.ru>