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MathGroup Archive 2005

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Re: TrigExpand - Odd behavior

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55438] Re: TrigExpand - Odd behavior
  • From: "Matthias Bode" <lvsaba at hotmail.com>
  • Date: Wed, 23 Mar 2005 05:34:48 -0500 (EST)
  • References: <200503220851.DAA23768@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hello Bob,

please compare:

Chop[TrigExpand[Cos[x + N[45*Degree]]]]

with

N[TrigExpand[Cos[x + Pi/4]]]

"45 Degree" by itself simply does not yield the value in radians which 
Cos[ ] requires; N[Degree] does.

Best regards,

MATTHIAS BODE
Torres Sofer III, depto. 9 A
Pedro Borda #1072
esq. Ismael Vásquez
COCHABAMBA/BOLIVIA

CEL: +591-70 71 56 64
TEL/FAX: +591-4-4 53 34 17
LVSABA at HOTMAIL.COM
Time indicated: UTC.

----- Original Message ----- 
From: "Bob Stagat" <stagat at linkline.com>
To: mathgroup at smc.vnet.net
Subject: [mg55438]  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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