2n丌t u(te dt= 1[T2 he dt T T-2 2n丌t h T h T2n丌i n丌2 1丌 SIn (n=±1,±22…) 1丌 2n丌t hT 1丌T u(t) 彡×√ Sin T n=-00 n≠0 (1≠士+kr,k=0,±1,…) 2 HIGH EDUCATION PRESS 机动目录上页下页返回结束u t e t T T n t i ( ) d 1 2 2 2    − − − − = 2 2 2 d 1    he t T T n t i T n n h    = sin (n = 1,  2 , )  = + T h u t  ( )  h T n t i n e T n n    2 sin 1  + =− n  0       = − 2n i T T h    −  −  =  − T n i T n i e e n i h    2 1 T n t i e 2  − 2  2 − 机动 目录 上页 下页 返回 结束