{icque noufmus efle ~^ — C. At vero noftra podre- 

 ma formula dat pro hoc cafu 



J^^il-zizC ideoque JL±y_ — C 

 quod egregie conuenit. 



§. 21. Confideremus etiam cafum , quo a— i, 

 ^ — 5 et c—iy ita vt proponatur haec aequatio: 



— ^ — H ^ _ — o , 



cuius integrale eft 



7". A tang. f^^ -f- ,-i^ A tang. ^^ C , 

 vnde fequitur fore 



A tang. '(*-4->-4-»»Vi _ c , 



ideoque etiam -f^2^t^ — c. At vero forma integra- 

 lis inuenta pro hoc cafu dabit 



X -^y-\-{x-hy )* -i-x y-^xy (x -^.y) r* 



{,—xy)- 



quae in fadorcs refoluta aat 



{i-j-x-t-y) (x^y-t-xy) rj. 



fi — xy)'' 



Prior vero aequatio 



'-^rt»^ — C inuerfa praebet »-±^>-=:£^ — G, 



a-hx-hy — xy r x-hy-t-xy ' 



ct vnitate fubtradla ^^~- — C , atque haec in praece- 

 dentem du<fla dat '-±^±^ — C. 



I — xy 



§. aa. Videamus igitur , vtrum haec pofteriores 

 aequationes inter fe conueniant, et quia conftantes vtrin- 

 que inter fe difcrepare poflunt, ambas aequationes ita re- 

 feramus : 



>•— XT» „ ^f. , + x-^-y /5. 



= a et i^ 



D 3 vnde 



