Re: ?1/2

*To*: mathgroup at smc.vnet.net*Subject*: [mg95690] Re: [mg95676] ?1/2*From*: Robert Pigeon <robert.pigeon at videotron.ca>*Date*: Sun, 25 Jan 2009 06:49:45 -0500 (EST)*References*: <200901241121.GAA05015@smc.vnet.net>

Rationalize[N[ex1]] ?? Robert -----Original Message----- From: dimitris [mailto:dimmechan at yahoo.com] Sent: 24 janvier 2009 06:22 To: mathgroup at smc.vnet.net Subject: [mg95690] [mg95676] ?1/2 I found it in another forum as a simplification chalenge and considered it quite interesting. The following expression is equal to 1/2. In[58]:= ex1 = ArcCsch[2]/(ArcSinh[2] - ArcCsch[2])/Sin[Pi*(ArcCsch[2]/(ArcSinh [2] - ArcCsch[2]))]; In[62]:= N[ex1, 50] Out[62]= 0.50000000000000000000000000000000000000000000000000 In[61]:= Developer`ZeroQ[ex1 - 1/2] Out[61]= True Nevertheless, no matter what I tried I was not able to simplify ex1 directly to 1/2. Any ideas? Dimitris

**References**:**?1/2***From:*dimitris <dimmechan@yahoo.com>