input: Write a function to calculate the sum of squares of all even numbers in a list using lambda function.
  assert fx([1, 2, 3, 4, 5]) == 20
  assert fx([3, 4, 5, 6, 7, 8, 9, 10]) == 240
  assert fx([10, 20, 30, 40]) == 3000
output: def fx(lst):
      return sum(map(lambda x: x**2, filter(lambda x: x % 2 == 0, lst)))