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Brahmagupta, an influential Indian mathematician and astronomer, was born in 598. He made significant contributions to the field of mathematics, including the development of new methods for solving quadratic equations and the discovery of Brahmagupta's theorem, which relates the diagonals of a cyclic quadrilateral. Brahmagupta's work had a profound impact on the development of mathematics in India and beyond, and his ideas continue to be studied and applied today.