For the person at rest, velocity v (in liters per second) of airflow during the respiratory cycle (time from beginning of one breath to beginning of next) is given by v = 0.7 sin((pi)(t)/(2)) where t is time (in seconds). (Inhalation happens when v > 0, and exhalation happens when v < 0.) A) Determine time for one full respiratory cycle. B) Compute number of cycles per minute.