Question

who is known as father of trigonometry ?
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Answer 1

Hipparchus

Hipparchus of Nicaea was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry but is most famous for his incidental discovery of precession of the equinoxes. Hipparchus was born in Nicaea, Bithynia, and probably died on the island of Rhodes, Greece.

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Answer 2

"Hipparchus" is the father of modern trigonometry.