A solution of the nonlinear second-order differential equation x' + x - x3 = 0 satisfies
Chapter 11, Problem 35(choose chapter or problem)
A solution of the nonlinear second-order differential equation x' + x - x3 = 0 satisfies x(O) = 0 and x' (0) = v0 Use the phase-plane method to determine when the resulting solution is periodic. [Hint: See Example 9.]
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