For a person at rest, the velocity v (in liters per second) of airflow during a respiratory cycle (the time from the beginning of one breath to the beginning of the next) is given by v = 0.8 sin , where t is the time (in seconds). (Inhalation occurs when v > 0, and exhalation occurs when v < 0.) (a) Find the time for one full respiratory cycle. sec (b) Find the number of cycles per minute. cycles/min

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