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OpenStudy (anonymous):
Our cycle of normal breathing takes place every 5 seconds. Velocity of air flow , y, measured in liters per second, after x seconds is modeled by the equation below. y=0.4cos(2pi/5x) Velocity of air flow is positive when we inhale and negative when we exhale. Within each breathing cycle when are we inhaling at a rate of 0.2 liters per second?
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