Malambo, Priestly. “Pre-Service Mathematics teachers’ Nature of Understanding of the Tangent Function”. JRAMathEdu (Journal of Research and Advances in Mathematics Education) 5, no. 2 (June 1, 2020): 105–118. Accessed November 17, 2025. https://journals2.ums.ac.id/jramathedu/article/view/9295.