1210 



o 





and accordingly 



1 r 4 « / })jt\ 



f{y) = ~— Ie c?M ^ 6y, M/' cos lyu — 1 



o 

 where ö^ has the preceding values. 

 Writing this 



00 "" 



f {ij) = — n I e du [cos yu S^ -|- sin yu S^] 



we have 



S, = :E{-\)'^bpUP 



0.2 



p-\ 



S, = 2 ( — 1) 2 è;,!./' 



1.3 



or, expressing hp in function of the values A 



O 



1—00 «ojt 



and in ttie same wav 



,24: 



S = — e^ ê (-1)" ^^^'^ u^l'+' . 



therefore 





or finally 



1 Too ctfjUP { . />.-rA , 



Of course this is only a formal solution, which holds when the 

 values Up are such as to make this integral convergent. This is e.g. 

 the case if 



