表达式1: "f" left parenthesis, "x" , right parenthesis equals StartFraction, sin left parenthesis, "x" , right parenthesis Over "x" , EndFractionfx=sinxx
1
"x" Subscript, 1 , Baselinex1
"f" left parenthesis, "x" Subscript, 1 , Baseline , right parenthesisfx1