question
- To: mathgroup at smc.vnet.net
- Subject: [mg77935] question
- From: dimitris <dimmechan at yahoo.com>
- Date: Wed, 20 Jun 2007 05:28:38 -0400 (EDT)
Hi.
Say
o=(16-x^2)^(1/2)-(4-x)^(1/2)*(4+x)^(1/2);
In another CAS one must use assumptions
in order to simplify
>o:=sqrt(16-x^2)-sqrt(4-x)*sqrt(4+x);
> combine(u) assuming x>-4,x<4 ;
> simplify(%);
2 1/2 1/2 1/2
o := (16 - x ) - (4 - x) (4 + x)
2 1/2 1/2
(16 - x ) - ((4 - x) (4 + x))
0
In Mathematica one simply gets
In[10]:=
Simplify[o]
Out[10]=
0
I would like to hear your comments on this issue.
Dimitris
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