"We know that the trigonometric sine is not mentioned by Greek mathematicians and astronomers, that it was used in India from the Gupta period onwards... The only conclusion possible is that the use of sines is an Indian development and not a Greek one. But Tannery, persuaded that the Indians could not have made any mathematical inventions, preferred to assume that the sine was a Greek idea not adopted by Hipparchus, who gave only a cable of chords. For Tannery, the fact that the Indians knew of sines was sufficient proof that they must have heard about them from the Greeks."
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Joseph Needham, as quoted in R.C. Majumdar, "Nationalist Historians" Historians of India, Pakistan and Ceylon ed. Philips, from E. Sreedharan, A Textbook of Historiography, 500 B.C. to A.D. 2000.
https://en.wikiquote.org/wiki/History_of_trigonometry
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History of trigonometry
begins with the early study of triangles, traced to the , in () and . Trigonometry was also prevalent in Kushite mathematics.
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