, \dot \theta, t)$ of this system depends explicitly on time.)  Our goal is to design a time-dependent control law $u = \pi (\theta, \dot \theta, t)$ that makes the pendulum spin at constant velocity $\dot \theta = 1$.
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          Use feedback cancellation to design a control law $u=\pi(\theta,\dot\theta, t)$ that results in the closed-loop dynamics $\ddot \theta = f(\dot\theta)$, where $f(\cdot)$ is the function you found in part (a).
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