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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>