Which 9th-century Persian mathematician compiled early tables of tangents and cotangents around 860?

Habash al-Hasib al-Marwazi

Habash al-Hasib al-Marwazi was a 9th-century astronomer and mathematician associated with Baghdad who compiled early tables of tangents and cotangents around 860. Tangent methods existed earlier, including in 8th-century China, but his work became important in Islamic astronomical computation.