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Built-In fuctions redefined---How?

  • To: mathgroup at
  • Subject: [mg62589] Built-In fuctions redefined---How?
  • From: Virgil Stokes <virgil.stokes at>
  • Date: Tue, 29 Nov 2005 04:44:26 -0500 (EST)
  • Sender: owner-wri-mathgroup at

How can I introduce the following definitions:

    cx for Cos[x]
  sx for Sin[x]
where, the argument x, will always be a single symbol, and then still be 
able to use the trigonometric identities associated with Sin, Cos; e.g.,

  cx^2 + sx^2 = 1

Note, this is not  c x (3 symbol expression); but,  cx (2 symbol 
Why? Because I have some rather large matrices with many elements that 
contain expressions in Cos and Sin terms that make printing and 
displaying messy and using the MatrixForm can give truncation in the 
printed output.

--V. Stokes


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