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The BETA.INV function is a statistical function that calculates the inverse of the cumulative beta probability density function (beta CDF). It's essentially used to determine the beta distribution quantile for a given probability. This means that given a probability, the function returns the value for which the cumulative beta distribution function is equal, effectively serving as the inverse operation to the BETADIST function or its CDF equivalent in certain software. The BETA.INV function is widely used in statistical analysis, financial modeling, quality control, and any domain requiring uncertainty modeling within a fixed interval.