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The value of cos2π/17 expressed in quadratic radicals.*

Published online by Cambridge University Press:  20 January 2009

Steggall
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Call 2π/17 α, and let

Then from trigonometry

and

Now let

Type
Research Article
Information
Proceedings of the Edinburgh Mathematical Society , Volume 7 , February 1888 , pp. 4 - 5
Copyright
Copyright © Edinburgh Mathematical Society 1888

References

* This paper is merely intended to show how the solution of this interesting case of the binomial equation may be exhibited in a form suitable for a course of Elementary Trigonometry.