只[4+k-CD+8 R-0 ∑「AP+BR-Cr-DRun(sl=0 [4R2+B2(-CR-DR]。=0 AR+B, Ro-+=CR+D,-+I) 施加我们的己知条件,首先,我们发现φ的形式比较简单所以 9=∑[4R+BR]P(cos) A+BR+ARcos 8+B,- cos+.=Po A=Po A1=0 B=0 =∑[cR+DR]Pcos Co+Dor+C. 8+ D, COS 8+.=-EoR Cos 8+Po =9o -eo C1=0> 把已知的A,B,C1,D代入Ar+Br=Cpr+Dr(+0 ( 1) ( 1) ' ( ' 1) ' ( ' 1) ' ' ' ' ' , ' 0 (cos ) (cos ) 0 l l l l l l l l l l l l l l l l l l l l R R A R B R C R D R A R B R C R D R P P    − + − + − + − + = →     + − − + − − =      0 2 ( 1) ( 1) 2 0 (cos ) 0 l l l l l l l l l l R R A R B R C R D R P   − + − + = →   + − − =   0 2 ( 1) ( 1) 0 l l l l l l l l R R A R B R C R D R − + − + →   + − − =   ( 1) ( 1) 0 0 0 0 l l l l A R B R C R D R l l l l − + − + + = + 内 外 施加我们的已知条件，首先，我们发现 内 的形式比较简单所以 ( 1) 0 1 2 0 0 1 1 0 0 0 (cos ) cos cos 0 0 l l l l l l l l A R B R P A B R A R B R A A B        − + = − − = +     = + + + +  =  =   =    = 内  ( 1) 0 1 2 0 0 1 1 0 0 0 0 1 0 (cos ) cos cos -E -E 0 >1 l l l l l R l l C R D R P C D R C R D R R Cos C C C l         − + → = − − = +     = + + + +  = +  =   =    = 外  把已知的 , , , A B C D l l l l 代入 l l l l ( 1) ( 1) A r B r C r D r l l l l − + − + + = +