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The Arab algebraic works between the IXth and XVth centuries, apart from the resolution of equations of the first and second order, included the cubic equations. To these equations led different kinds of problems, such as the division of a sphere by a plane, the trisection of the angle, the search of the side of a regular polygon of 9 sides and so on. Apart form the separation from the algebra, the most important characteristic of the Arab mathematics was the formation of the trigonometry. In relation to the problems of astronomy, they made charts of the trigonometric functions with a great frequency and a high degree of accuracy, not only in plane but also in spheric trigonometry. Al Khowarizmi was a great mathematician and astronomist and a member of "The House of Knowledge", founded in Bagdad (809833), in which wise men, jews and christians coming from Syria, Iran and Mesopotamia, worked together. Note: Opinions expressed in comments are those of the authors alone and not necessarily those of Daniel Pipes. Original writing only, please. Comments are screened and in some cases edited before posting. Reasoned disagreement is welcome but not comments that are scurrilous, offtopic, commercial, disparaging religions, or otherwise inappropriate. For complete regulations, see the "Guidelines for Reader Comments". << Previous Comment Next Comment >> Reader comments (104) on this item
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