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Exact value of Cos[Pi/17]

• To: mathgroup at smc.vnet.net
• Subject: [mg14833] Exact value of Cos[Pi/17]
• From: "Christopher Gorski" <cgorski at adelphia.net>
• Date: Wed, 18 Nov 1998 01:29:38 -0500
• Sender: owner-wri-mathgroup at wolfram.com

In The Mathematica Book, there is an example on page 936 of Mathematica
returning the exact answer to Cos[Pi/17].  When I try it out on my NT
machine, however, (mathematica v.3), it simply returns Cos[Pi/17]. 
I've searched throughout the book, and I can't figure out how to get my
system to return a answer as in the example given.  It will return
simple things, Cos[Pi], for example, returns -1, but more complex
arguments won't work.

--
Christopher Gorski
cgorski at adelphia.net
http://www.contrib.andrew.cmu.edu/~cgorski