Expression 1: "f" left parenthesis, "x" , right parenthesis equals StartFraction, left parenthesis, "x" positive sin left parenthesis, "x" , right parenthesis plus 0.5 times sin left parenthesis, 2.3 "x" plus 0.7 , right parenthesis plus 0.1 times cos left parenthesis, 5.1 1 times "x" negative 0.2 , right parenthesis , right parenthesis Over 2 , EndFractionfx=x+sinx+0.5·sin2.3x+0.7+0.1·cos5.11·x−0.22