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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).
Chord (geometry) - Chords in trigonometry. 1  Chords were used extensively in the early development of trigonometry. 2  The chord function is defined geometrically as shown in the picture. 3  The last step uses the half-angle formula. 4  The inverse function exists as well...