Expression 4: "y" equals "F" left parenthesis, "x" minus "t" , right parenthesis plus "G" left parenthesis, "x" plus "t" , right parenthesisy=Fx−t+Gx+t
4
Expression 5: "y" equals "F" left parenthesis, "x" minus "t" , right parenthesis plus 1y=Fx−t+1
5
Expression 6: "y" equals "G" left parenthesis, "x" plus "t" , right parenthesis minus 1y=Gx+t−1
6
Expression 7: "g" left parenthesis, "x" , right parenthesis equals "x" exponent left parenthesis, negative "x" squared , right parenthesisgx=xexp−x2