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Re: Hyperbolic function identity

• To: mathgroup at smc.vnet.net
• Subject: [mg50947] Re: [mg50932] Hyperbolic function identity
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Wed, 29 Sep 2004 03:15:11 -0400 (EDT)
• Reply-to: hanlonr at cox.net
• Sender: owner-wri-mathgroup at wolfram.com

expr = ArcCosh[1+z^2/2]-2*ArcSinh[z/2];

FullSimplify[TrigToExp[expr], z>0]

0


Bob Hanlon

> 
> From: carlos at colorado.edu (Carlos Felippa)
To: mathgroup at smc.vnet.net
> Date: 2004/09/28 Tue AM 12:58:52 EDT
> To: mathgroup at smc.vnet.net
> Subject: [mg50947] [mg50932] Hyperbolic function identity
> 
> Why 
> 
>    FullSimplify[ArcCosh[1+z^2/2]-2*ArcSinh[z/2],z>0];
> 
> does not evaluate to 0?
> 
>