code: def F_6(x, n):
      c = 0.9
      mu = (np.arange(1, n + 1) - 0.5) / n
      return x - 1 / (
          1
          - c
          / (2 * n)
          * (mu[:, None] * x / (mu[:, None] + mu)).sum(axis=1)
      )
  
imports: from __future__ import division, absolute_import, print_function
  import itertools
  import numpy
  from numpy import exp
  from numpy.testing import assert_, assert_equal
  from scipy.optimize import root
label_desc: Use image node_id 11 for calling a global function with example usage: F_6(x, n) and returns: unknown