53 



2 -i- y -+- i/3 H- |a H- /- rz: o ; etc. 

 unde prîores saltein litciae has recipiunt determinationcs: 

 ar=:~î; (Hrro; Y = ^f, 5=ro; etc. 

 §. j6. Quo autem lios valoies facilius investigemus, 

 consideremus hanc seriem : 



y=:l-i-a.z-\-^z*--\-YZ^~\- etc. 

 ciijus scilicet summam V quaeii opoiteat. Inde ergo se- 

 quentes dérive mus séries : 



2 y zn i -h- 2 oLZ -h 2 (^ zz -h 2 y z'^ -h 2 ^ -z* -h 2 ez^ -^ etc. 

 V z =: ^ i 2. -+- a z !& 



|VZZ— — H- I 



etc. 

 Hamm igitur serierum summa, ob aequalitates ante allatas, 

 fiet m 1, sicque habebimus istam aequationem : 



y {2-\-z-^lz^-\~ 1%^ -{- rj^ z* 4- etc.) — 1. 

 Quare cain sit 



e~ =z 1 4- z. -f. î 2,2 _(_ 1 z^ -)- etc. 

 erit manifeste V (i -f- e~) ^: i, sive Vzir^-^, unde fit 



2y—i — --4. 



5. 17. Ponatur igitnr nt ante z-sr = w» ut sit 

 2 V zi: 1 — u, sitque iteruiii z:zz 2t, ita ut u zz ^-^- — , et 



