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Mangwende E, Chirume S. An APOS analysis of preservice mathematics teachers’ understanding of limits of trigonometric functions. J.Res.Adv.Math.Educ [Internet]. 2025 Oct. 31 [cited 2026 Jan. 19];10(4):240-53. Available from: https://journals2.ums.ac.id/jramathedu/article/view/10440