How many 
artial derivatives does a function of two variables have?
Definitions:
Fluid
A substance that flows and can take the shape of the container that holds it; can be a liquid or gas.
Emphysema
A long-term, progressive lung disease characterized by shortness of breath and destruction of air sacs in the lungs, affecting their elasticity.
Pulmonary Disease
A term for diseases affecting the lungs and other parts of the respiratory system.
Exhale
To breathe out; the process of releasing air from the lungs.
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