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Trigonometric functions
The trigonometric functions Analysis index History Topics Index The use of trigonometric functions arises from the early connection between mathematics and astronomy. Early work with spherical triangles was as important as plane triangles. The first work on trigonometric functions related to chords of a circle. Given a circle of fixed radius, 60 units were often used in early calculations, then ...
www-groups.dcs.st-andrews.ac.uk/~history/HistTopics/Trigonometric_functions.html
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