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The responses of nonlinear vibrating systems are investigated analytically using Homotopy Perturbation Method (HPM). To demonstrate the validity of the proposed method, the results obtained by HPM have been depicted graphically and have been compared with those of the exact solution. A clear conclusion can draw from the numerical results that the method provides highly accurate solutions to the discussed problem.doi:10.3844/ajassp.2008.1219.1224 fatcat:fuvpewzmdngt3prrmim5fpx5xm