Find 
using implicit differentiation. 
Definitions:
Vital Capacity
The maximum amount of air a person can expel from the lungs after a maximum inhalation, used as a measure of lung function.
Tidal Volume
The volume of air moved into or out of the lungs during normal breathing.
Inspiratory Reserve Volume
The additional amount of air that can be inhaled after a normal inhalation, increasing lung volume.
Expiratory Reserve Volume
The maximum volume of air that can be forcibly exhaled after the completion of a normal, quiet exhalation.
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