2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/61167We contribute to the method of trigonometric series for solving differential equations of certain non linear oscillators. Key Words: series power solution, trigonometric series.8 pages. To appear in Appl. Math.LettersClassical Analysis and ODEs34A20Remark on Periodic Solutions of Non Linear Oscillatorstext