Evaluate the double integral 
for the given function f(x, y) and the region R. 
; R is bounded by 
and y = x.
Definitions:
Inheritance
A fundamental concept in object-oriented programming where a class can inherit properties and methods from another class.
Programmer-Defined Data Types
Custom data types created by programmers to encapsulate complex structures not provided directly by the language.
Class Construction
The process of defining a class in object-oriented programming, including its properties, behaviors, and interactions with other classes.
Derived Class
A class that inherits properties and behaviors from another class, known as the base class.
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