#*z:^— .; flatuairnis v-u-\-'iZ, \t prodeat 



e'' — 



u — l Z 1 u — z 



hinc erit z~l{iu — z) — l{^u-\-z) et diffcrentiando 

 ^ ^ — 4 ( z d « - ^j^) , qnam ergo fornnilam viciflim ita integrari 

 oportet , vt pofito z — o fiat « — i. Statuatur nunc 

 u — s z^ ac fumto z zz o fiet j z: — oo ; tum autem erit 

 </ z — - * "^ ' , ex qua iam aequatione eiusmodi feriem pro 

 s quaeri oportet, vt fumto z — o fial s — oo. 



§. 27. Cum igitur hinc habeamus ^.jj — iz:^, 

 pro J" fingamus hanc fericm: 



2 j — |- -h B 2 -i- C s' -+- D 5;' -i- E s' 4- etc. 



vnde fit 



^' = - ^^4-B-i-3C5Js4- 5 Ds^H-VEis^-i- etc. , 

 tum yero 



4jj-^+2AB-f 2 AC5;5:-f 2 ADs* + 2A £5;'+ etc. 

 + BB +2BC +2BD +etc. 



+ CC 

 quibus feriebus fubftitutis aequatio ^ s s — 1 ~~ —o 

 fuppeditat hanc expreflioncm : 



^-2B-6C2:2;-ioD;3*-i4.Es*-isF5;^-etc.? 



+AA + 2AB + 2AC + 2AD+2AE + 2 AF+etc. 

 -1 +BB +2BC +2BD + 2EE+etc. 



+ CC +2CD+etc.j 



= 0. 



A&a Acad, Imp, Sc. Tom. V. P. 11 I Hinc 



