Nasir al-Din al-Tusi's 13th-century treatise presents a complete system of spherical trigonometric formulas with proofs based on the secant figure and Menelaus' theorem, along with historical details on its development by Arab mathematicians.
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Spherical trigonometry before the modern era:The treatise of Nasir al-Din al-Tusi
Nasir al-Din al-Tusi's 13th-century treatise presents a complete system of spherical trigonometric formulas with proofs based on the secant figure and Menelaus' theorem, along with historical details on its development by Arab mathematicians.