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Re: TrigExpand - Odd behavior

The unusual result that you obtain simplifies back to the original expression 
so it appears to be a legitimate representation.  This represenation is 
probably due to Degree being in symbolic form.  Use FunctionExpand to 
convert Degree to an exact numeric or manually convert Degree

expr=Cos[x+45 Degree];


(Cos[x] - Sin[x])/Sqrt[2]


(Cos[x] - Sin[x])/Sqrt[2]

%==expr // FullSimplify


Bob Hanlon

> From: "Bob Stagat" <stagat at>
To: mathgroup at
> Date: 2005/03/22 Tue AM 03:51:07 EST
> To: mathgroup at
> Subject: [mg55423]  TrigExpand - Odd behavior
> 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 ~

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