Ibrahim ibn Sinan

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Ibrahim ibn Sinan ibn Thabit ibn Qurra ,Arabic ابراهيم بن سنان بن ثابت بن قرة (Ibrahim ibn Sinan; 908, Baghdad – 946) was an Arabic mathematician and astronomer who studied geometry and in particular tangents to circles. He also made advances in the theory of integration. He is often referenced as one of the most important mathematicians in the medieval Islamic world.