The `det()` function in Python's `sympy` library is used to calculate the determinant of a matrix. The determinant represents a scalar value that can be computed for a square matrix. It provides important information about the properties and behavior of the matrix, such as invertibility and solutions to systems of linear equations. By using the `det()` function on a `Matrix` object, one can obtain the determinant value, which is useful in various mathematical applications and calculations.
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