16.2u,1cn1 0 dp p ap p ao A cos Φ"+A=0 d(o)=Am, cos mo+B, sin mo OR aR AR=O u(p, p)=Co+D In p+>(Cmp"+DmPm)(Am cos mo+Bm sin mp) 圆内含p=0,故D.=0(,q)=C+∑p"( Amn cos mo+ Bn sin mo) = de-po= A cos o Acos p=Co+EP(A, cosmo+Bm sin mo) A=APo APo=A 其余系数均为零。 u(e, ) =aP-coso16. 0 1 1 2 2 2 2 2 =   +   +        u u u   cos 0 u = = A (1) 0 2 2 2 − =   +   R R R      ''+ = 0 m () = Am cosm + Bm sin m ( , ) ln ( )( cos sin ) 1 u   C0 D0  C  D  Am m Bm m m m m m = + + m + +  = −   cos 0 u = = A cos ( cos sin ) 1 A  C0 0 Am m Bm m m m = + +  = A = A1 0 圆内含  = 0 ，故 Dm = 0 ( , ) ( cos sin ) 1 u   C0  Am m Bm m m m = + +  = 1 1 A 0 = A −  其余系数均为零。 ( , ) cos . 0    u   = A