Development of a Deep Mathematics DEMA Model of Sequences and Series Based on North Kalimantan Batik for Class X DKV SMK Negeri 4 Tarakan. JITER [Internet]. 2026 Aug. 25 [cited 2026 Oct. 6];1(1):29-44. Available from: https://journal.cakrajiyaedukasi.com/jiter/article/view/3