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The development of modern trigonometry shifted during the western Age of Enlightenment, beginning with 17th-century mathematics (Isaac Newton and James Stirling) and reaching its modern form with Leonhard Euler (1748).
(ËtrÉªg ÉËnÉm Éª tri) n. the branch of mathematics that deals with the relations between the sides and angles of plane or spherical triangles, and the calculations based on them. [1605â15; < New Latin trigÅnometria; see trigon, -o-, -metry] trig`oâ¢noâ¢metâ²ric (-nÉËmÉ trÉªk) trig`oâ¢noâ¢metâ²riâ¢cal, adj. trig`oâ¢noâ¢metâ²riâ¢calâ¢ly, adv.