The angle 0 made by a swinging pendulum and a vertical line is given by 0 = 0.8 cos (xt) radians, where time 1 is measured seconds. What is the maximum (positive) angle made by the pendulum? (Use decimal notation. Give your answer to one decimal place.) maximum angle: radiar How often does the pendulum return to this maximum angle? (Give an exact answer. Use symbolic notation and fractions where needed.)

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