Publisher's Synopsis
Excerpt from A Treatise on Plane and Spherical Trigonometry, Vol. 1 of 12: With Their Most Useful
After the time of Ptolemy and his commentator Theon, little more is known on this subject till about the close of the eighth century after Christ, when the ancient method of computing by the chords was changed for that of the sines, which were first intro duced into the science by the Arabians; to whom we are also indebted for the several axioms and theorems which are at present considered as the foundation of our modern Trigonometry, as well as for some other propositions which such an alteration in the system naturally required.
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