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Re: Can someone explain this?
 To: mathgroup at smc.vnet.net
 Subject: [mg19161] Re: [mg19106] Can someone explain this?
 From: Richard Gass <gass at physics.uc.edu>
 Date: Thu, 5 Aug 1999 23:59:04 0400
 Sender: ownerwrimathgroup at wolfram.com
You wrote:
>Using Mathematica 3.0.1.1x on a PowerMac 9600/233 under system 8.5.1, I
>get the
>following. No matter what variation I try, I can't get Mathematica to replace
>Tan[x] with Sin[x]/Cos[x]. (Ultimately I'd like to do this with more
>complicated expressions.)
>
>In[1]:= Tan[x]/.Tan[z_]>Sin[z]
>
>Out[1]= Sin[x]
>
>In[2]:= Tan[x]/.Tan[z_]>z Sin[z]
>
>Out[2]= x Sin[x]
>
>In[3]:= Tan[x]/.Tan[z_]>Sin[z]Cos[z]
>
>Out[3]= Cos[x] Sin[x]
>
>In[4]:= Tan[x]/.Tan[z_]>Sin[z]/Cos[z]
>
>Out[4]= Tan[x]
Try this
Tan[x] /. Tan[x] > HoldForm[Sin[x]/Cos[x]]
The problem is that the kernel evaluates Sin[x]/Cos[x] as Tan[x].
Richard Gass
Department of Physics
University of Cincinnati
Cincinnati, OH 45221
phone 5135560519
EMail gass at physics.uc.edu
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