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THOMAS FINCKE (6 January 1561 – 24 April 1656) was a Danish mathematician and physicist , and a professor at the University of Copenhagen
Copenhagen
for more than 60 years.

Fincke was born in Flensburg
Flensburg
, Schleswig
Schleswig
and died in Copenhagen
Copenhagen
. His lasting achievement is found in his book Geometria rotundi (1583), in which he introduced the modern names of the trigonometric functions tangent and secant .

His son in law was the Danish physician and natural historian, Ole Worm , who married Fincke's daughter Dorothea.

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