Expression 2: "g" left parenthesis, "x" , right parenthesis equals sine left parenthesis, "x" plus "a" , right parenthesis Has graph. To audio trace, press ALT+T.gx=sinx+a
Expression 4: "h" left parenthesis, "x" , right parenthesis equals "f" left parenthesis, "x" , right parenthesis plus "g" left parenthesis, "x" , right parenthesis Has graph. To audio trace, press ALT+T.hx=fx+gx