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Problem 9.19PP Sketch the time-optimal control law for X I = X 2 , JC2=-Xl+U. IkI 0. Step 4 of 5 Sketch the reverse curve for the given system. Step 5 of 5 The trajectories for this system are circle s centered at (±1,0 ) . This is called the Bushaw problem in optimal control literature. Thus, the required figure is sketched.