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100.20 Outside the box

Published online by Cambridge University Press:  14 June 2016

Jim Simons
Jim Simons*
Affiliation:
Foxcote, Noverton Lane, Prestbury, Cheltenham GL52 5BB e-mail: jimsimonsfoxcote@googlemail.com
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Information
The Mathematical Gazette , Volume 100 , Issue 548 , July 2016 , pp. 323 - 329
Copyright
Copyright © Mathematical Association 2016 

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References

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5.Jahnel, J.. When is the (co)sine of a rational angle equal to a rational number?, available at http://www.uni-math.gwdg.de/jahnel/Preprints/cos.pdfGoogle Scholar