Evaluate the double integral 
for the given function f(x, y) and the region R. 
; R is the rectangle defined by 
Definitions:
Ventricle
Cavity in an organ, such as a lower chamber of the heart or the ventricles of the brain.
Capillaries
The smallest blood vessels in the body, responsible for the exchange of oxygen, carbon dioxide, and other nutrients and waste products between the blood and tissues.
Arteries
Blood vessels that carry oxygen-rich blood away from the heart to the body's tissues, characterized by their strong, elastic walls.
Atrioventricular Valve
Valves located between the atria and ventricles of the heart that prevent the backflow of blood during ventricular contraction.
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