由边条得: (r,)=-Eorcosp+2r"(Cn sin no +D cos no) Eoasino->na "(Dn sin np-C, cos np)=0 C.=0 Eos 2 n≠ D.=0 a(,p)=-Eorcosp+Ea2r-cos p 2E E cOSe r=a( ) ( ) 0 1 0 1 2 1 0 n 2 1 0 0 0 0 0 , cos ( sin cos ) sin ( sin cos ) 0 0 1 D 0 , cos cos 2 n n n n n n n n n r a r E r r C n D n E a na D n C n C D E a n r E r E a r E COS r                − =  − = − =  = − + + − − = = =  =  = − +  = − =    由边条得：