Sholahudin, U., Oktaviyanthi, R., Lutfiah, N. N., & Ramahi, R. J. (2026). Mapping cognitive transitions in extended-angle trigonometry: A mixed-methods PCA analysis of university students’ representational thinking . Journal of Honai Math, 9(1), 119–140. https://doi.org/10.30862/jhm.v9i1.1122