Expression 5: "f" left parenthesis, "x" , right parenthesis times left bracket, 1 , 1 , right bracket left brace, "a" less than or equal to "x" less than or equal to "b" , right bracefx·1,1a≤x≤b
5
Expression 6: "l" Subscript, "e" "n" , Baseline equals Start integral from "a" to "b" , end integral, StartRoot, 1 plus "f" prime left parenthesis, "x" , right parenthesis squared , EndRoot "d" "x"len=∫ba1+f′x2dx