28 X COS 2k+1)x|2 28 2k+1)z cOS d x (2k+1) 2L (2k+1)z Ql 4l8(-1) 2k+1 4l8 (2k+1)x146(-1)261 SIn (2k+1)丌(2k+1)2x 0 (2k+1)丌 u(xt= 丌台62/cos(2k+1mtn(2k+1)z 4ls(-1) 2k+1 ∑ SIn Q1 21 差别在于两个坐标系中一个是非惯系!l k l k x k l k l 2 2 0 2 1 2 (2 1) sin (2 1) 4 (2 1) 4 ( 1)      + + − + − = +   (2 1) 4 ( 1) 2 1 + − = + k l k . 2 (2 1) sin 2 (2 1) cos 2 1 4 ( 1) ( , ) 2 1 0 l k x l k at k l u x t k k     + + + − =  + =  差别在于两个坐标系中一个是非惯系！ . 2 (2 1) cos (2 1) 2 2 (2 1) cos (2 1) 2 2 0 2 0 dx l k x l k k x x k l l       + + + + + = 