表达式7: exponent left parenthesis, negative "x" squared , right parenthesisexp−x2
7
表达式8: StartFraction, 1 Over "x" , EndFraction exponent left parenthesis, negative "x" squared , right parenthesis1xexp−x2
8
表达式9: StartFraction, 1 Over "x" squared , EndFraction exponent left parenthesis, negative "x" squared , right parenthesis1x2exp−x2
9
表达式10: "x" exponent left parenthesis, negative "x" squared , right parenthesisxexp−x2
10
表达式11: "x" squared exponent left parenthesis, negative "x" squared , right parenthesisx2exp−x2
11
表达式12: StartFraction, arctan left parenthesis, "x" , right parenthesis Over StartNestedFraction, pi NestedOver 2 , EndNestedFraction , EndFractionarctanxπ2