運算式 3: "f" prime left parenthesis, "a" , right parenthesis "x" plus "f" left parenthesis, "a" , right parenthesis minus "f" prime left parenthesis, "a" , right parenthesis "a"f′ax+fa−f′aa
3
運算式 4: "f" prime left parenthesis, "a" , right parenthesis left parenthesis, "x" minus "a" , right parenthesis plus "f" left parenthesis, "a" , right parenthesisf′ax−a+fa