Haryani D, Subagjo A, Hamdani M, Ali Hasan Q, Widyanti N. ANALYSIS OF THE DIFFICULTIES OF CLASS X STUDENTS OF SMKN 4 PALANGKA RAYA IN SOLVING TRIGONOMETRY PROBLEMS. JPN [Internet]. 27 Juni 2022 [dikutip 18 Agustus 2025];23(1):29-38. Tersedia pada: https://e-journal.upr.ac.id/index.php/JPN/article/view/4667