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I have an analytical expression using two folds of approximations.

To check out how good the expression is doing, I need to verify at three levels.

- Compare the solution to the equation I have after the first RWA approximation and the final result;
- Compare the solution to the equation I have after the first RWA approximation and the solution to the original equation;
- IF the solution works well in the previous two comparisons, compare the solution to the original equation and the final analytical expression.

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