input: Write a function to convert degrees Fahrenheit to degrees Celsius. The function should take a temperature in Fahrenheit as input and return the equivalent temperature in Celsius.
  assert FahrenheitToCelsius(32)==0
  assert FahrenheitToCelsius(212)==100
  assert FahrenheitToCelsius(98.6)==37
  assert FahrenheitToCelsius(50.0)==10.0
  assert FahrenheitToCelsius(0)==-17.78
output: def FahrenheitToCelsius(f):
      return round((f - 32) * 5 / 9, 2)