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Rational cosines

The Endeavour 2013-12-20

Summary:

When does a rational portion of a circle have a rational cosine? If r is a rational number, cos(2πr) rational if and only if the denominator of r is 1, 2, 3, 4, or 6. This means that the special…

Link:

http://feedproxy.google.com/~r/TheEndeavour/~3/w188DNkEBs8/

From feeds:

Statistics and Visualization » The Endeavour

Tags:

math

Authors:

John

Date tagged:

12/20/2013, 07:11

Date published:

12/10/2013, 22:52