Expression 3: 0 less than "y" less than "f" left parenthesis, "x" , right parenthesis left brace, "a" less than "x" less than "b" , right brace0<y<fxa<x<b
3
Expression 4: 0 greater than "y" greater than "f" left parenthesis, "x" , right parenthesis left brace, "a" less than "x" less than "b" , right brace0>y>fxa<x<b