224 



é" 



ZZZX -\- y i -\- XX 



ex relationc 1"*, hincque fit 



OJ m log. (X + |/ 1 + XX) 



unde differentiando colligitur 



da zzz ■ ^=: et oj — / -7r=-= . 



V l-i-xx ■' V i'\~xx 



Facile quoque intelligitur fore ex 1 et 2 



t) =z log. (@ . co + € . Où) 

 — (li z^ log. (£ . w — © . u) 



S. 10. Quod si expressionum 5. 5. diiîerentialia sumantur 

 prodibit 



f) . (S . OJ = 9 • ùj C-— ^ ) = () oo . (£ . OJ , 



d . £ . OJ = c) . 6J (_ 5 } zr: d OJ . ti* . 0) , 



hincque vicissim erit 



fda (E • OJ = <© . OJ , 



fdoi ©. OJ =::: £ . o) . 

 Eodem modo , cum fit 



euu — (,— nu -, 



© . n OJ = j ' 



Tico _i_ -, — nu 



(E . noj : 

 ei-it generalius 



Ô . . 72 ÙJ Z= 723a3 . £ . 7J0J , 



3 . d . 7z 0) zr ndiù . iS . noj , 

 et vicissim 



/Doj£ . 7Z0J = ^ (S . nco , 



/3CO0 . «CO = - £ . 7iOJ , 



tum vero quoque erit 

 hoc est 



