

( 280 ) 



wc subtnict i'rnm A, tho [)art 2w(3-w2)X-V3 f 1/ ^^— f " «a?i-i ^ . (Z.i- , 



■which part, as we saw above, was already added to C-y After 

 various lengthy developments we find at last: 



D^ = 2« (3— «2) ["2 ,(• i/;^~;^te?i-i - - to-i 5 — 



]/ 



- % (•'■ 4- 2) 1/ l-,r<a«-i -== + l/(,r-V4.) (^— «-) '««-' ^ - 



2 , 11 4 -1 



And in the same way for 

 3;r— 2 



after transformation of the inteo-ral Vn I 1/ ««?i— ' n^ . (/;r into 



^'2 [— j V '[^rZr^ ^"-"-"^ "'• '^''' + 2 l/(.'-— '/j)Oc— n^)««w-' n~ — 



and subtraction of the integral already added to Q : 



r 1 /'■■'^^^ 



2 I )/ — tan~^ nz . dx , 



J .r — ?4- 



we find : 



r Vo 'A 



]>x = — 4 2.7;i/ a'— H-üaM-i— =r;^=to«-i //>— 2/m '1— .r tot-' -— =^= + 



L I/.'— 'A l/j-— Vi. 



-|-l/(;^l/7)(,i.-l„2)^„,-l ,^; — 2«<aM-l z'y-'lontan-^ V2~'l-(12) 

 If we now join all the similar terms, we shall find for 

 UA + i; -[- C + ])) J.r 



