(B2)22(B)2=2+p2 lv=0 (B) dd(z d(z dz dz Bre2-d= d (z (Br dz (Bdz (Br)dz (Br)zr-dz Iv=0 d1() (By)2=2d(B)2=2- (B) d(2)(22+-1 dv Iv=0 (B) l=0 d(Bz. B2'Brds*l7 (Br )2v+ [1 ]v=0 d(Brr) Bz d(Bz. (Br.dz d z dz d d z d ( ) / ( )     = z dz d −1 =   ) ( ) ( ( ) ) ( ) ( 1 1 2 z dz d z dz d d z d − − =         z dz d z dz d 1 2 2 2 2 1 2 ( ) ( 1) ( ) − − − = −        ] 0 ( ) [1 ( ) ( ) 2 2 1 2 2 2 2 1 2 + + − = − − v z dz z dv z dz d v          ] 0 ( ) [1 ( ) ( ) ( 1) ) ( ) ( 2 2 2 2 1 2 2 1 2 + + − = − + − − v z dz z dv z dz dv v d z d             ] 0 ( ) [1 ( ) ( ) ( 2 2 2 2 1 2 + + − = − v z dz z dv v d z d         ] 0 ( ) [1 1 ) ( ) ( 2 2 1 2 + + − = − v z dz z dv z v d z d           ] 0 ( ) [1 ( ) 1 ) ( ) ( 2 2 2 + + − v = d z z dv z v d z d         