于是∑→ → =0m+n=0 =S y(x *米 2m"t"=∑J(x) n=0m0(m+m)!n!2 sin 0 问:①Jn(x)= 1 rin+ ul= ie de 兀l 1=1,(+)0 x)=ne(mud或 J, (x)=o cos(xsin 0-ne)de 丌于是 l 0 m n 0 n - - m n ¥ ¥ ¥ ¥ = + = = = ¥ å ® å ® ® å å ∴ ( ) 1 - 2 - 0 - (-1) 2 ( ) ( )! ! 2 x t t m m n n n n n m n x e t J x t m n n ¥ ¥ ¥ + = ¥ = = ¥ = = å å å + (**) 问：① ( ) 1 - sin 2 1 1 ( 1) 1 1 ( ) 2 2 x t ix t i n i n n t e e J x dt ie d i t i e q q q q p p + = + = = — — ò ò l ∴ 1 ( sin - ) ( ) 2 i x n n J x e d p q q p q p = ò- 或 0 1 ( ) cos( sin - ) n J x x n d p q q q p = ò