Expression 1: "f" left parenthesis, "x" , "y" , right parenthesis equals StartAbsoluteValue, "x" minus "y" , EndAbsoluteValue plus StartAbsoluteValue, "x" plus "y" , EndAbsoluteValuefx,y=x−y+x+y
1
Expression 2: "f" left parenthesis, "f" left parenthesis, "x" , "y" , right parenthesis , 2 "z" , right parenthesis equals 4ffx,y,2z=4