Can someone explain this?

• To: mathgroup at smc.vnet.net
• Subject: [mg19106] Can someone explain this?
• From: belotto at vassar.edu (Benjamin Lotto)
• Date: Thu, 5 Aug 1999 01:35:22 -0400
• Organization: Vassar College
• Sender: owner-wri-mathgroup at wolfram.com

```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]

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```

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