_ *1 f v'(J - ?) B - k 2 0 J 1 _ 0." sn * (ul? /() 



V/ae".a ( 1 ^s.i(/r./.)ni(//, < /.i(li.(A,,A).sir(u J ,A)^ 



/."' s m ( A , , /;)(■ 1 1 ( // , , /, ) ( 1 1 1 ( A\ , k) J i — A 2 sir (A, , A ) . sn*(u>, A) 



= d,fn(iu, A,, A)^ 



(]j-2) = a .<•>'( A. 



A'sii(A,,A)<i)(A,.A)(lii(A..A)' 



