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Inequality: An inequality compares two values using symbols such as < (less than), > (greater than), ≤ (less than or equal to), or ≥ (greater than or equal to). Absolute values are often used in inequalities.

Distance Formula: The distance formula calculates the distance between two points in coordinate space. It involves taking differences and absolute values.

Piecewise Function: A piecewise function defines different rules for different parts of its domain. Absolute values are commonly used in defining piecewise functions.