input: Write a python function to evaluate whether a given expression is valid or not.
  assert evaluate_expression("2 + 2 == 4") == True
  assert evaluate_expression("5 / 0") == False
  assert evaluate_expression("abs(-1) == 1") == True
  assert evaluate_expression("unknown_var + 1") == False
output: def evaluate_expression(expression: str) -> bool:
      try:
          return eval(expression)
      except (ZeroDivisionError, NameError, SyntaxError):
          return False