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Vu Thi Minh Tuong and Pham Quy Muoi 2019. APPLICATION OF TANGENT EQUATIONS TO CREATIVE AND PROVE SOME INEQUALITIES. UED Journal of Social Sciences, Humanities and Education. 9, 2 (Jun. 2019), 7-16. DOI:https://doi.org/10.47393/jshe.v9i2.141.