Expression 1: "y" equals StartFraction, "e" Superscript, "x" , Baseline plus "e" Superscript, negative "x" , Baseline Over 2 , EndFraction left brace, negative 1 less than "x" less than 1 , right brace Has graph. To audio trace, press ALT+T.y=ex+e−x2−1<x<1