def test_matrix_cofactor_3x3():
A = Matrix([[3, 5, 0], [2, -1, -7], [6, -1, 5]])
assert A.minor(0, 0) == -12
assert A.cofactor(0, 0) == -12
assert A.minor(1, 0) == 25
assert A.cofactor(1, 0) == -25
def test_matrix_minor_3x3():
A = Matrix([[3, 5, 0], [2, -1, -7], [6, -1, 5]])
b = A.submatrix(1, 0)
assert b.determinant == 25
assert A.minor(1, 0) == 25
