Calculate the iterated integral. 
Definitions:
After-Tax Lorenz Curve
A graphical representation that shows the distribution of income or wealth within an economy after accounting for taxes.
Before-Tax Lorenz Curve
A graphical representation that shows the distribution of income or wealth among individuals or households before taxes are applied.
Lorenz Curve
A graphical representation of income or wealth distribution within a society, showing the proportion of overall income earned by cumulative percentages of the population.
Income Inequality
The imbalanced dispersion of income across various economic participants, including individuals and households.
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