There is no Contribution of Thales in the field of trignometry.........
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Thales
Several great mathematicians have made contributions to trigonometry. Pitiscus wrote books on plane and spherical trigonometry, and Hipparchus produced a table of chords.
Thales, Democritus, Pythagoras, Aristotle, Archimedes, Euclid, Erastosthenes, Hipparchus,
based on my stock knowledge, i think hipparchus is the father of trigonometry.....
moivre's formula