input: Write a python function to evaluate a mathematical expression given as a string using the `eval` function.
  assert evaluate_expression("2 * (3 + 1)") == 8
  assert evaluate_expression("10 / 2") == 5.0
  assert evaluate_expression("5 + 6 - 3") == 8
output: def evaluate_expression(expression: str) -> float:
      return eval(expression)