6(t)(> ∑ 6(-n00)=006(O) n=-00 f(t) F(0) ott t 0002000   =−  =− = = n j n t j n t n T e T e T t 0 0 1 1 ( )    ( ) ( ) 2 ( ) 0 0 0           − =   n=− T n T t     0 T 2T t f (t) F() 0 0 20  (1) ( ) 0