Long description: fig2

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A three-dimensional graph showing a surface defined by the function f(x, y) over a rectangular region in the xy-plane.

Alt text: A three-dimensional graph showing a surface defined by the function f(x, y) over a rectangular region in the xy-plane.

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    • The image displays a three-dimensional graph with the vertical axis labeled with "f(x, y)".
    • The horizontal plane represents the input variables, with an axis labeled with "x" and another labeled with "y".
    • The surface itself shows a curved shape rising above the base region, indicating a function of two variables.
    • The base of the surface is defined over a rectangular region extending from "x = a" to "x = b" along the "x" axis and from a lower bound to "y = d" along the "y" axis.
    • Several dashed lines and labels indicate the boundaries of the region, including "x = a," "x = b," "y = c," and "y = d," providing context for the domain of the function.

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