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Re: ?1/2


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



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