“The Relationship Between Grade 11 Students’ Achievement in Trigonometric Functions and Their Teachers’ Content Knowledge”, Mediterr. J. Soc. Sci., vol. 5, no. 4, p. 443, Mar. 2014, Accessed: Apr. 24, 2025. [Online]. Available: https://www.richtmann.org/journal/index.php/mjss/article/view/2233