See Yan WONG, “Rethinking the Pedagogical Sequence of Trigonometric Formulae in Secondary Education : A Preliminary Assessment of an Alternative Teaching Approach in a Hong Kong Secondary ”, ijmrr, vol. 16, no. 3, pp. 204–306, Sep. 2026, Accessed: Oct. 23, 2026. [Online]. Available: https://ijmrr.com/index.php/ijmrr/article/view/759