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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).
(History of Trigonometry Wikipedia) and (Mac Tutor History)â¢ 1596 ADâConpernicus was the ï¬rst to deï¬ne trigonometric functions directly in terms of right triangles instead of circles, with tables for all six trigonometric functionsâ.