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On Deducing the Properties of the Trigonometrical Functions from their Addition Equations

Published online by Cambridge University Press:  20 January 2009

R. F. Muirhead
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Extract

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Take first the Addition-Formula of the Tangent :

Assume that 1 – tanx tanO is not zero for all value of x II.

Type
Research Article
Information
Proceedings of the Edinburgh Mathematical Society , Volume 14 , February 1895 , pp. 127 - 134
Copyright
Copyright © Edinburgh Mathematical Society 1895

References

* The contrary supposition, that it is negative at first, would lead to similar results.