FullSimplify regress?
- To: mathgroup at smc.vnet.net
- Subject: [mg81416] FullSimplify regress?
- From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
- Date: Sat, 22 Sep 2007 03:31:52 -0400 (EDT)
In Mathematica 5.2:
FullSimplify[ComplexExpand[ArcTan[Cos[Arg[z w]-Arg[z]-
Arg[w]],Sin[Arg[z w]-Arg[z]-Arg[w]]],{z,w},TargetFunctions->
{Re,Im}]]
0
In Mathematica 6.01:
FullSimplify[ComplexExpand[
ArcTan[Cos[Arg[z*w] - Arg[z] - Arg[w]],
Sin[Arg[z*w] - Arg[z] - Arg[w]]], {z, w},
TargetFunctions -> {Re, Im}]]
ArcTan[Cos[ArcTan[Re[w], Im[w]] + ArcTan[Re[z],
Im[z]] - ArcTan[Re[w]*Re[z] - Im[w]*Im[z],
Re[z*Im[w] + w*Im[z]]]],
-Sin[ArcTan[Re[w], Im[w]] + ArcTan[Re[z], Im[z]] -
ArcTan[Re[w]*Re[z] - Im[w]*Im[z],
Re[z*Im[w] + w*Im[z]]]]]
This looks like a bit of a regress to me.
Andrzej Kozlowski