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18: Керований осцилятор
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$x(t)=a^{\prime} \cos \left(\omega t+\alpha^{\prime}\right)+\frac{f}{m\left(\omega^{2}-\gamma^{2}\right)}[\cos (\gamma t+\beta)-\cos (\omega t+\beta)]$ \(x(t)=a^{\prime} \cos \left(\omega t+\alpha^{... $x(t)=a^{\prime} \cos \left(\omega t+\alpha^{\prime}\right)+\frac{f}{m\left(\omega^{2}-\gamma^{2}\right)}[\cos (\gamma t+\beta)-\cos (\omega t+\beta)]$ $x(t)=a^{\prime} \cos \left(\omega t+\alpha^{\prime}\right)+\frac{f}{2 m \omega} t \sin (\omega t+\beta)$ $x=A e^{i \omega t}+B e^{i(\omega+\varepsilon) t}=\left(A+B e^{i \varepsilon t}\right) e^{i \omega t}, \quad A=a e^{i \alpha}, \quad B=b e^{i \beta}$