Example #2: Exponential function e u(t),a> 1/a X(w c(te cte- jwt dt e-(a+ju)t )t at3 atW X(jo)=1/(a2+o) ∠Ⅹ(j0)=tan(oa) π/2 1/a 兀/4 1/ay2 a a a a /2 Even symmetry Odd symmetryExample #2: Exponential function Even symmetry Odd symmetry