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Consider the force, but undamped system described by the initial value problem u'' + u =...

Consider the force, but undamped system described by the initial value problem u'' + u = 3 cos(ωt), u(0) = 0, u'(0) = 0 (a) Find the solution u(t) for ω != 1. (b) Find the solution u(t) for ω = 1 (Resonance)

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