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Application of a modified He's homotopy perturbation method to obtain higher-order approximations of an force nonlinear oscillator

Numerical AnalysisEngineeringPerturbation MethodSingularly Perturbed ProblemHigher-order ApproximationsForce Nonlinear OscillatorHomotopy Perturbation MethodOscillation TheoryGeometric Singular Perturbation TheoryNonlinear EquationComputational MechanicsApproximation Theory