^91 



o 

 we obtain 



X 



o 



2y(3) (..) = 2./ (..) +J<f (,i) f - 4 /, + 3 1,-1,] d^. 

 o 

 Thus 



2y(3)(^) + 4[2/\iJ(..)]=:2 V (.f) -J^(/i^)[i, + 7,]c^|?=2./ (.^•) -SJ^ /,((^)^^^c//?. 



where 



4 ^((J)^'^^^ c/i = 6„ 7, + ^ 7^ + b, I, -f- . 



1 



1 



+ y K^e + C4A + Cji 4- • • •] 



o o 



o 

 This gives the solution 



X 



r 7,(,f-/3) r iJ.v-8) 



2r/(,t.)- [2y(3)(.^)] -4[2/(i)(..)] = /(/?)-^^^f' d,^-\-'ó m^—Lld^iU). 



J ^'—P J A'— /i 



u 



By differentiating 



X 



f{w)=Jrf{ii)I,{.v--^)d^ 



we obtain 





