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Transpose a matrix

**Question:**
Write a function called `transpose_matrix` that takes a matrix represented as a list of lists and returns the transposed matrix. Use `zip` to transpose the matrix.

**Example:**
Input: [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
Output: [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
def transpose_matrix(matrix):
    """
    Transposes a matrix represented as a list of lists.

    Args:
        matrix (list): The input matrix.

    Returns:
        list: The transposed matrix.
    """
    # TODO: Implement the transpose_matrix function
    pass