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Thomas Fincke (January 6, 1561 - April 24, 1656) was a Danish mathematician and physicist, and a professor at the University of Copenhagen for more than sixty years.
Fincke was born in Flensburg, Schleswig and died in Copenhagen. His lasting achievement is found in his book Geometria rotundi (1583), in which he introduced the trigonometric functions tangent and secant.
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