A Postverification Method for Solving Forced Duffing Oscillator Problems without Prescribed Periods

<table>It illustrates the phase plane with the initial value point<b> A</b> (stable) in the left panel and shows the phase plane with the initial value point<b> B</b> (unstable) expressed in (37) in the right panel.</table>

Journal of Applied Mathematics

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Figure 6

Figure 6: A Postverification Method for Solving Forced Duffing Oscillator Problems without Prescribed Periods 