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Georg von Purbach
used Arabic numerals to prepare a table of sines
Johann Muller / Regiomontanus
introduced geometric and algebraic methods to Germany
Georg Joachim Iserin
was the first to relate trigonometric functions to angles
Hipparchus
father of trigonometry
Abraham de Moivre
wrote Miscellanea Analytica
The Arabs
first to discover tangent and cotangent
William Oughtred
introduced sin, cos, and tan as abbreviations for sine, cosine and tangent, respectively
Ptolemy
he wrote the Almagest
Leonhard Euler
the most prolific writer of mathematical subjects
Bartholomeus Pitiscus
the first to write a book bearing the title Trigonometry
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