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Start Over You searched for: Title Taḥrīr Kitāb Mānālāwis fī al-ashkāl al-kurīyah ✖ Remove constraint Title: Taḥrīr Kitāb Mānālāwis fī al-ashkāl al-kurīyah Century 13th century ✖ Remove constraint Century: 13th century Keywords Spherical trigonometry ✖ Remove constraint Keywords: Spherical trigonometry