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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).
He was also responsible for establishing a number of important trigometrical relationships.â (History of Trigonometry Wikipedia)tan a = sin a cos aâ¢ 10th CenturyâAbu al-Wafa al-Buz jani were using all six trigonometric functions.