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Ptolemy's Theorem and certain Trigonometrical Formulæ

Published online by Cambridge University Press:  31 October 2008

A. G. Burgess
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Extract

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Let XOX′ = 1 be the diameter of a circle,

Then the lines representing the sines and cosines of the angles,

are marked in the figure.

Type
Research Article
Information
Edinburgh Mathematical Notes , Volume 4 , April 1910 , pp. 42 - 43
Copyright
Copyright © Edinburgh Mathematical Society 1910