20 uep. =f() ulpeps =f i(o) u(p,)=Co+Do In p+>(CmP"+DmPm)(Am cos mp+Bm, sin mp) p2 f()→f(q)=C+Dhn+∑(CnP+Dn)(A1 cos mpp+ b sin m 2m=2=f2(9) f2()=Co+DoIn p2+2(CmP2"+DmP2m)(Am cos mo+Bm sin mp) Co+Do In p,=o f()dp=fie (CmP+Dmp)a f()cos mondo=f +dIn f2(lo=f2 nPi)B do=fim (CmP2+DmP2")A、2 f,()cos mado=f, (CmP"+DmP2m)Bm ==f2(p)sin modo=f220. 1 2 ( ) u  =1 = f 1  ( ) u = 2 = f 2  ( , ) ln ( )( cos sin ) 1 u   C0 D0  C  D  Am m Bm m m m m m = + + m + +  = − ( ) u  =1 = f 1   ( ) ln ( )( cos sin ) 1 f 1  C0 D0 1 C 1 D 1 Am m Bm m m m m m = + + m + +  = − ( ) 2 2 u = = f   ( ) ln ( )( cos sin ) 1 f 2  C0 D0 2 C 2 D 2 Am m Bm m m m m m = + + m + +  = − 1 10 2 0 0 0 1 ( ) 1 C + D ln = f d = f       20 2 0 0 0 2 2 ( ) 1 C + D ln = f d = f       1 1 2 0 1 1 1 ( )cos 2 ( ) m m m m m m C + D A = f m d = f  −        2 2 2 0 2 2 2 ( )sin 2 ( ) m m m m m m C + D B = f m d = f  −        2 1 2 0 2 2 2 ( )cos 2 ( ) m m m m m m C + D A = f m d = f  −        1 2 2 0 1 1 1 ( )sin 2 ( ) m m m m m m C + D B = f m d = f  −       