Surprising FullSimplify result

*To*: mathgroup at smc.vnet.net*Subject*: [mg111458] Surprising FullSimplify result*From*: Sam Takoy <sam.takoy at yahoo.com>*Date*: Mon, 2 Aug 2010 07:04:26 -0400 (EDT)

Here's what I am getting Cos[theta]^2 + Sin[theta]^2 // FullSimplify Out[540]= 1 Cos[theta]^2 + Sin[theta]^2 + L^2 Cos[theta]^2 // FullSimplify Out[541]= 1/2 (2 + L^2 + L^2 Cos[2 theta]) I'm really surprised that the answer in the latter case is not 1+ L^2 Cos[theta]^2 Is there an explanation? Thanks, Sam

**Follow-Ups**:**Re: Surprising FullSimplify result***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>