The model mx'' + kx + k 1 x 3 = F 0 cos t of an

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The model mx'' + kx + k1x3 = F0cos ωt of an undamped periodically driven spring/mass system is called Duffing s differential equation. Consider the initial-value problem x'' + x + k1x3 = 5 cos t, x(0) = 1, x'(0) = 0. Use a numerical solver to investigate the behavior of the system for values of k1 > 0 ranging from k1 = 0.01 to k1 = 100. State your conclusions.

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