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Another damn simplifying problem: ArcTan

  • To: mathgroup at smc.vnet.net
  • Subject: [mg59910] Another damn simplifying problem: ArcTan
  • From: Mathieu McPhie <m.mcphie at fz-juelich.de>
  • Date: Thu, 25 Aug 2005 06:33:49 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Can someone please explain this to me: (M v4.something)

In:=  Simplify[ArcTan[-x]+ArcTan[x]]
Out= 0

In:=  Simplify[ArcTan[-x,1]+ArcTan[x,1]]
Out= ArcTan[-x,1]+ArcTan[x,1]

Note, I want something more complicated than this obviously. Actually 
want something like

Simplify[ArcTan[-x,y]+ArcTan[x,y]]

but above is the easiest example of this infuriating programs problem.

Cheers, Mathieu


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