Trigonometry (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Trigonometry" in English language version.

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etymonline.com

  • Harper, Douglas. "trigonometry". Online Etymology Dictionary. Retrieved 2022-03-18.

intel.com

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iranicaonline.org

  • "ṬUSI, NAṢIR-AL-DIN i. Biography". Encyclopaedia Iranica. Retrieved 2018-08-05. His major contribution in mathematics (Nasr, 1996, pp. 208–214) is said to be in trigonometry, which for the first time was compiled by him as a new discipline in its own right. Spherical trigonometry also owes its development to his efforts, and this includes the concept of the six fundamental formulas for the solution of spherical right-angled triangles.

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semanticscholar.org

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st-andrews.ac.uk

mathshistory.st-andrews.ac.uk

  • "Nasir al-Din al-Tusi". MacTutor History of Mathematics archive. Retrieved 2021-01-08. One of al-Tusi's most important mathematical contributions was the creation of trigonometry as a mathematical discipline in its own right rather than as just a tool for astronomical applications. In Treatise on the quadrilateral al-Tusi gave the first extant exposition of the whole system of plane and spherical trigonometry. This work is really the first in history on trigonometry as an independent branch of pure mathematics and the first in which all six cases for a right-angled spherical triangle are set forth.
  • "Johann Müller Regiomontanus". MacTutor History of Mathematics archive. Retrieved 2021-01-08.

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