Expression 3: Start integral from 1 to 2, end integral, "f" left parenthesis, "x" , right parenthesis "d" "x"∫21fxdx
3
Expression 4: 0 less than or equal to "y" less than or equal to "f" left parenthesis, "x" , right parenthesis left brace, 0 less than or equal to "x" less than or equal to 1 , right brace0≤y≤fx0≤x≤1
4
Expression 5: "f" left parenthesis, "x" , right parenthesis less than or equal to "y" less than or equal to 0 left brace, 1 less than or equal to "x" less than or equal to 2 , right bracefx≤y≤01≤x≤2