P. 128, Equation 4.8

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Equation 4.8 should be

x(t)=\left(x_0 - \frac{\delta}{1-r^2} \right) \cos \omega_n t + \frac{\dot x_0}{\omega_n} \sin \omega_n t + \frac{\delta}{1-r^2} \cos \omega t

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