Mulyono, B. and Hapizah 2021. ANALYSIS OF MATHEMATICAL WRITING ERRORS RELATED TO THE ANGLE OF TRIGONOMETRI FUNCTIONS. Kalamatika: Jurnal Pendidikan Matematika. 6, 1 (Apr. 2021), 71-82. DOI:https://doi.org/10.22236/KALAMATIKA.vol6no1.2021pp71-82.