Esinot sinnott Eo 2 /o Lcos(n-1)ot-coS(n+ Dat]dt Esinot· sinotd t 0 eo Eo sin 2ot (1-coS 2ot)dt E 0 2丌 0 0 n>1时 b Ea sin(n-1)ot sin(n+1)ot 0 2(n-1)o (n+1)o HIGH EDUCATION PRESS 机动目录上页下页返回结束b Esin t sin t d t 0 1       =    n t n t t E cos( 1) cos( 1) d 2 0  = − − +          − − =     ( 1) sin( 1) 2 n E n t bn 0 ( 1) sin( 1) 0 =    + + −     n n t 2 0 sin 2 2             = − t t E n > 1 时 机动 目录 上页 下页 返回 结束