k f(x)=∑bsn ktL k=2 f(5)s,d5 kx08516=[(-1)+]=14 k-2n+1 4 (x) h=(2n+1)Sin(2n+1)x 频域中的图示由你们给出( ) sin , 1 l k x f x b k k    = = . 2 1 4 0 2 , [ ( 1) ] 2 [ cos ] 2 ( )sin 2 0     − + = = = − = − − + = − k n k k n k k k d l k b f k l l k           sin( 2 1) . (2 1) 4 ( ) 0 n x n f x n + + =   =  频域中的图示由你们给出