Nasiraddin Tusi - development of geometry and mathematics

This V part of essays from the series "Science Genius Muhammad Nasiraddin Tusi": Tusi lived 770 years ago and created several immortal works on geometry and mathematics. In writing his work "De trainqulus", Regiomontaine used Toosi's work "Sheklul Gita". French mathematician historian Montyuklo clearly stated that European scientists of the XV century could not write a major work in the field of trigonometry. This indicates that in this area Tusi was ahead of Western scientists on several tables and so many of his works in order to use them as sources, were stolen from the libraries of Byzantium and the Apennine peninsula. Also Salekh Zeki, touching on this problem, said that Regiomontand used the works of Eastern scholars and therefore his works are only a successful compilation.Tables of trigonometric functions from "Sheklul Gita", shows that in XV century Europe by Regiomontand and the same mathematical scientists, in the field of trigonometry was done much less than their eastern counterparts.