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Transformations in expressions

• To: mathgroup at smc.vnet.net
• Subject: [mg91874] Transformations in expressions
• From: Miguel <misvrne at gmail.com>
• Date: Thu, 11 Sep 2008 06:15:03 -0400 (EDT)

Hi all,
How can I to transform a specific expression to other by substitution
of a part of it.

For example, I want to transform the expression Log[x^2+y^3]/
Sin[x^2+y^3] in Log[z]/Sin[z] by substitution x^2+y^3 --> z.

And other question: Is the new expression dependent of z. I see it is,
but how can I to programar it.

Thanks

• Follow-Ups:
  • Re: Transformations in expressions
    • From: "peter lindsay" <pl.0@me.com>