iv:z-V{cc — iiz)j hincquc 



7 a z d z 



vnde coUigitur elementum arcr.s A Z 

 quocirca habebimus 



il'~ — y cV(ci: — as) 



§. 17. Cum igitur in gencrc pofuifremus 



H.Z J y' \ -i- Czz -i- Ei,*} ' 



aute omnia noftram formulam ad eandem formam redu- 

 camus, dum fcilicct cius numeratorcm et denominatorem 

 muhiplicamus per V {c -}- {a a - c c) z z), tum autem pro- 

 dibit 



/ c V (c c — z 2) (c* _)- !a a — c c) zz) * 



vnde patct, pro hoc cafu fore L zr c\ Mzzaa — ccet 

 N — o; dcinde vero A — c\ C~c*{aa— zcc) et 



'E- — cc{aa — cc)\ncie,{i vt fupra breuitatis gratia ponamus 



Z 1= y A (A -f- C s 2 H- E 2*) ' crit 



Z — c^ V {c c — z z) {c*^ -\- [a a — c c) z z). 



His igitur formuHs eodem modo vti conueniet, vti in gc- 

 nere e(t monftratum. 



§. 18- Quo has f*)rmulas concinniorcs rcddamus, 

 loco htterae c introducannu'> fcniiparamctrum cllipfis, qui 

 fit — ^, et cum fit cc — ab, fict primo 



Z — a'bbVb{ab-zz){abb-^{a-b)zz)j 

 ACta Acad. Imp. Sc. Tom. V. P. //. E hinc- 



