tcibinan

from sympy.solvers import solve
from sympy.abc import x

def getDeepDotQuality(func, arg, val, n = 3):
  dy = func.diff(arg)
  dyn = dy.subs(arg, val)
  if (dyn == 0):
    return getDeepDotQuality(dy, arg, val, n+1)
  elif (n % 2 == 1):
    return 'has an inflection point'