 However it was not sufficient for the more accurate computational requirements of astronomy.The search for more accurate formulas by Indian astronomers eventually led to the discovery the power series expansions of sin "x" and cos "x" by Madhava of Sangamagrama (c. 1350 – c. 1425), the founder of the Kerala school of astronomy and mathematics.Bhaskara I had not indicated any method by which he arrived at his formula.