X< ,(x0-6,x+o) 26 (x>x-) n(x,1)=∑Bsin naat. nTA sIn 2p0+ n 2v n丌 B COS 5 (cos -COS+sin sin )S ds 26 220 226 2 n COS COS ds +sin 5n丌 sIn d2} n 26 2 2 x0- COS Isin( )5+sn( )2]d5 2 126 [cos( nt,I nZ (x0-6)-cos( xo +ol+ cos(:-o8)-cos nT 1 (x0+) 2( l26 126 n n 2/"+1m +)6+ -{sn( 2( 126 26(2)       − − + −  − = = 0 ( ) ,( , ) 2 cos 0 ( ) 0 0 0 0 0 0 0      x x x x x x v x x ut t ( , ) sin sin . 1 l n x l n at u x t Bn n     = = sin . 2 cos 2 0 0 0 0         d l x n n a v B x x n  + − − = )sin . 2 sin 2 sin 2 cos 2 (cos 2 0 0 0 0 0             d l x x n n a v x x  + − = + sin }. 2 sin 2 sin sin 2 cos 2 {cos 2 0 0 0 0 0 0 0                  d l x n d l x n n a v x x x x   + − + − = +                 d l n l n d l n x x x x ) ] 2 1 ) sin( 2 1 [sin( 2 1 sin 2 cos 0 0 0 0 = + + −   + − + − )( )] 2 1 )( ) cos( 2 1 [cos( ) 2 1 2( 1 )( )] 2 1 )( ) cos( 2 1 [cos( ) 2 1 2( 1 0 0 0 0                 − − − − + − + − − + + + + = x l n x l n l n x l n x l n l n               ) 2 1 ) sin( 2 1 [sin( ) 2 1 2( 1 ) ] 2 1 ) sin( 2 1 [sin( ) 2 1 2( 1 0 − 0 − − + + + + = l n x l n l l n n x l n l n