MathGroup Archive 1999

[Date Index] [Thread Index] [Author Index]

Search the Archive

Can someone explain this?

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

Using Mathematica 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]

  Benjamin Lotto                 *  
  Department of Mathematics      *  e-mail:  belotto at
  Vassar College, Box 349        *  phone:  914-437-7180
  124 Raymond Avenue             *  fax:  914-437-7065
  Poughkeepsie, NY 12604-0349    *  
      WWW:  <>

  • Prev by Date: function arguments as subscripts
  • Next by Date: Re: Conversion of output
  • Previous by thread: Re: function arguments as subscripts
  • Next by thread: Re: Can someone explain this?