e宁字pcos0=2i0)+22I+1)e7pcs9) (11) 1=0 (cos))B(cos0) (12) 1=0 在(12)式两边乘以P(c0s0)后,对0从0~π积分, 2 利用勒让德多项式的正交性:∫nP(cos0)P,(cos)sin6u0= 21+1 .∑21+Die π2 =24e,2 =0 21+1 21+1 可以得到 Ae 6-=21+lr'e 1 1 ( ) 2 2 0 0 (cos ) 2 ( ) (2 1) (cos ) l i l i l l l l l l l Ae P ikf l i e P − − = = = + + 1 1 ( ) 2 2 0 0 (cos ) (2 1) (cos ) l i l i l l l l l l l Ae P l i e P − − = = = + i l l i l l A e l i e l 2 1 ) 2 1 ( = (2 +1) − − (12) (11) 可以得到 三、分波法(续6) 利用勒让德多项式的正交性: l 1 1 - ( ) 2 2 0 0 2 2 2 1 e 2 1 2 1 il i l l ll l ll l l l i e A l l − = = + = + + ( ) (12) (cos ) 0 ~ 在 式两边乘以Pl 后,对 从 积分, l l ll l P P d + = 2 1 2 (cos ) (cos )sin 0