A Nonstandard Finite Difference Schemes for the Damped Harmonic Oscillator with Trigonometric Denominators: Convergence Analysis, Systematic Damping-Regime Validation, and Energy Conservation. IJDM [Internet]. 2026 Sep. 8 [cited 2026 Sep. 9];3(3):088-106. Available from: https://ijdm.org.ng/index.php/Journals/article/view/396