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MathGroup Archive 2006

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Re: Sin[30*Degree] vs Sin[29*Degree]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72098] Re: [mg72057] Sin[30*Degree] vs Sin[29*Degree]
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Mon, 11 Dec 2006 04:55:36 -0500 (EST)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200612100949.EAA17387@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

The behavior is totally consistent.  Sin[30 Degree] can be expressed as 
an exact fraction.  Apparently the others cannot.

Why is the result (shown below in Inputform) in

   Sin[29 Degree]
Sin[29*Degree]

any more unexpected than the result in the following?

   Sin[29 Pi/180]
Sin[29 Pi/180]

Steven Shippee wrote:
> What is happening here:
> 
> Sin[30*Degree]
> Sin[31*Degree]
> Sin[29*Degree]
> which makes it appear that only the first line of input works?
> 
> However, if I do something like:
> 
> \!\(Sin[\(29*Pi\)\/180. ]\)
> 
> I get the expected result ... I'm sure it is me, what am I missing in that I 
> think I am not seeing consistent behavior?
> 
> Thanks in advance,
> 
> Steven Shippee
> 
> slshippee at comcast.net
> 
> 
> 
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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