A Nonstandard Finite Difference Schemes for the Damped Harmonic Oscillator with Trigonometric Denominators: Convergence Analysis, Systematic Damping-Regime Validation, and Energy Conservation. International Journal of Development Mathematics (IJDM), [S. l.], v. 3, n. 3, p. 088–106, 2026. DOI: 10.62054/ijdm/0303.05. Disponível em: https://ijdm.org.ng/index.php/Journals/article/view/396.. Acesso em: 25 oct. 2026.