Coba jelasin Abul Wáfa dari Matematik pada zaman pertengahan Islam dalam bahasa melayu dong

Persian mathematician Abu'l-Wáfa (940-998) invented the tangent function. The Indo-Arabic system of calculating allowed the extraction of roots by Abu'l-Wáfa.

Abu'l-Wáfa applied spherical geometry to astronomy and also used formulas involving sine and tangent.