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Re: TrigExpand

  • To: mathgroup at
  • Subject: [mg32483] Re: TrigExpand
  • From: Detlef Mueller <dmueller at>
  • Date: Wed, 23 Jan 2002 00:59:59 -0500 (EST)
  • Organization: University of Kassel - Germany
  • References: <a2b41r$li6$>
  • Sender: owner-wri-mathgroup at

Dave Snead wrote:

> TrigExpand[y+Cos[x]^2]
> returns
> 1/2 + y + Cos[x]^2/2 - Sin[x]^2/2
Really a strange Result (1 for y does 
leave Cos[...] alone again).

Another Question: 

Using trigonometric Functions, I like
to restrict to Sin, Cos, eventually Tan.

I find Objects like Sec, Csc ... very 
unnecessary, ugly and contraintuitive
(as they hide correlations and require
to memorize them, not really making
anything more easy).

Can one forbid Mathematical the use
of these (imo antiquated) 


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