Defines a Duffing equation: x'' + δx' + αx + βx^3 = γcos(ωt). Equivalent: x'' = -δx' - αx - βx^3 + γcos(ωt).
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Defines a Duffing equation: x'' + δx' + αx + βx^3 = γcos(ωt). Equivalent: x'' = -δx' - αx - βx^3 + γcos(ωt).