Who is asking: Student
Can you please tell me some history of the trigonometric ratio Tangent? who discovered it? when was it discovered and some other useful info...
The place that I look for answers to this type of question is Earliest Known Uses of Some of the Words of Mathematics. This is a resource maintained by Jeff Miller, a teacher at Gulf High School in New Port Richey, Florida. In it he has
|TANGENT (as a trigonometric ratio) was introduced by Thomas Fincke (1561-1656) in his Thomae Finkii Flenspurgensis Geometriae rotundi libri XIIII, Basileae: Per Sebastianum Henricpetri, 1583. He wrote tangens in Latin. In English, TANGENT is found in 1594 in Exercises by Thomas Blundevil.|
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