Expression 1: "f" left parenthesis, "x" , right parenthesis equals "x" Superscript, 2 thirds , Baseline plus 0.9 left parenthesis, 3.3 minus "x" squared , right parenthesis Superscript, 1 half , Baseline times sine left parenthesis, "a" times pi times "x" , right parenthesis Has graph. To audio trace, press ALT+T.fx=x23+0.93.3−x212·sina·π·x