Excerpt from On the Definitions of the Trigonometric Functions

I consider that the notation is a matter not of secondary, but of paramount importance. If the notation is arbitrary, it gives as no help in the further development of analysis; if on the other hand it is systematic and logically connected with the existing notation of analysis, it points the way to more general principles and results. I believe that this paper will show that my notation is systematic and logical.

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On the Definitions of the Trigonometric Functions (Classic Reprint)

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