Tang, M.D. and La, Y.N. 2024. Enhancing student’s mathematical competency in learning the graph and properties of the sine function by Google Sheets app on smartphone. Dong Thap University Journal of Science - Social Sciences and Humanities Issue. 13, 7 (Oct. 2024), 109–120. DOI:https://doi.org/10.52714/dthu.13.7.2024.1343.