(M,t)= (M)ds(M)ds Ana 当初始条件只与z相关时: 4w-》WFinnIJa rcos)(a)sin0d0 at 由定积分第二类换元法,令z+atC0SO=5,则: ∯2”s=2no5d5-…+ 同理可得到: ∯”s=2rjw0d5当初始条件只与z相关时: 由定积分第二类换元法,令 ,则: . . . . 2 1 ( ) ( ) ( , ) 4 M M S S at at M M u M t dS dS a t t t . . 2 2 0 0 ( ) ( cos ) ( ) sin M S at M z at dS at d d t at 2 0 ( cos ) 2 ( ) sin z at at d at z at cos . . ( ) 2 ( ) * M at z at z at S M dS d t 同理可得到: . . ( ) 2 ( ) ** M at z at z at S M dS d t