input: Write a python function to calculate the inverse of a 2x2 matrix.
  assert Matrix([[1,2],[3,4]]).get_inverse() == [[-2.0, 1.0], [1.5, -0.5]]
  assert Matrix([[4,7],[2,6]]).get_inverse() == [[0.6, -0.7], [-0.2, 0.4]]
  assert Matrix([[2,3],[1,4]]).get_inverse() == [[0.8, -0.6], [-0.2, 0.4]]
output: class Matrix:
      def __init__(self, data):
          self.data = data
  
      def get_inverse(self):
          a, b = self.data[0]
          c, d = self.data[1]
          determinant = a * d - b * c
  
          if determinant == 0:
              raise ValueError("Matrix is not invertible")
  
          inverse = [
              [d / determinant, -b / determinant],
              [-c / determinant, a / determinant]
          ]
          return inverse