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Re: TrigExpand - Odd behavior

• To: mathgroup at smc.vnet.net
• Subject: [mg55440] Re: TrigExpand - Odd behavior
• From: "David Park" <djmp at earthlink.net>
• Date: Wed, 23 Mar 2005 05:34:51 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Bob,

That does seem like a bug - or at least a feature. But the following
works...

Cos[x + 45 Degree] // N // TrigExpand // Chop
0.707107 Cos[x] - 0.707107 Sin[x]

Cos[x + Pi/4] // TrigExpand
Cos[x]/Sqrt[2] - Sin[x]/Sqrt[2]

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/



From: Bob Stagat [mailto:stagat at linkline.com]
To: mathgroup at smc.vnet.net


Try executing the following three lines and explain the last result...

Cos[45 Degree]

Cos[x+45 Degree]

Cos[x+45 Degree]//TrigExpand

Thanks...
~ BS ~