title: Find Harmonic Mean Using Arithmetic Mean Geometric Mean
signature: def find_harmonic_mean_using_arithmetic_mean_geometric_mean(a, b):
test_code: import array
  import bisect
  import collections
  import datetime
  import functools
  import heapq
  import itertools
  import math
  import queue
  import re
  import string
  import sys
  from typing import Any, Dict, List, Optional, Set
  
  
  # SOLUTION CODE
  # ============================================
  PLACEHOLDER_CODE_BODY
  
  # TESTING CODE 
  # ============================================
  def validate_solution(actual, expected):
      return abs(actual - expected) < 1e-09
  
  def driver(a, b, expected):
      try:
          if validate_solution(PLACEHOLDER_FN_NAME(
              a, b),
              expected
          ):
              return "PASSED"
          return "FAILED"
      except Exception as exception_obj:
          return type(exception_obj).__name__
      
  if __name__ == "__main__":
      result = driver(54, 83, 65.43065693430657)
      print(f"TEST-0...{result}")
  
      result = driver(42, 56, 48.0)
      print(f"TEST-1...{result}")
  
      result = driver(63, 12, 20.16)
      print(f"TEST-2...{result}")
  
      result = driver(19, 76, 30.4)
      print(f"TEST-3...{result}")
  
      result = driver(41, 50, 45.054945054945065)
      print(f"TEST-4...{result}")
  
      result = driver(7, 26, 11.030303030303031)
      print(f"TEST-5...{result}")
  
      result = driver(39, 42, 40.444444444444436)
      print(f"TEST-6...{result}")
  
      result = driver(11, 64, 18.773333333333333)
      print(f"TEST-7...{result}")
  
      result = driver(96, 81, 87.86440677966101)
      print(f"TEST-8...{result}")
  
      result = driver(15, 54, 23.47826086956522)
      print(f"TEST-9...{result}")
  
      sys.exit(0)
source_py: def find_harmonic_mean_using_arithmetic_mean_geometric_mean(a, b):
      AM = ((a + b) / 2)
      GM = math.sqrt((a * b))
      HM = ((GM * GM) / AM)
      return HM
source_cpp: double find_harmonic_mean_using_arithmetic_mean_geometric_mean(int a, int b) {
    double AM, GM, HM;
    AM = ( a + b ) / 2;
    GM = sqrt ( a * b );
    HM = ( GM * GM ) / AM;
    return HM;
  }