Page "Law of sines" Paragraph 61
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According to Ubiratàn D ' Ambrosio and Helaine Selin, the spherical law of sines was discovered in the 10th century.
It is variously attributed to al-Khujandi, Abul Wafa Bozjani, Nasir al-Din al-Tusi and Abu Nasr Mansur.
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