fiue 





^/^(a^ + ^^ + ^^^ + s^Z^cor.^j/^ + ^/T/C^^+c^-fl')^!^/-, 

 ^2;^ (a'- -l-Z/^ + r + 2a ^ cof. 2vi) + 2 ^^«'j/ C^' + <^' - fl*J 

 4- ^?y^ (a^- -f /,' + 1* - 2 fi ^ cof. 2 •vO :z N///\ 



Sumto niinc quadrato prioris aequationis et multiplicata 

 poderiori per a^ -^ b' -^- r 't- ^ a ^ cof. >); fi pj:odudorum 

 capiatur difFerentia, aequatio ita habebitur .exprcfTa : 



dyi"" ({a' + ^' + cy - 4 fi' ^' cof. 2 ;/* - (A^ + ^* - fl^)0 

 :::NJ;'(a'+^*-+ir*+2a& cof. ^-vj^-Lt/f^i 

 quae in hanc contrahitur: 



4flWvi'(t^+/»'fin.2V)- N^/'(/iM i&'+c'+2o5cor2y()-LVr. 

 Ex qua aequatione iam diflferentiale dt par d rf habetur 

 exprefiiim, huius autcm aequationis confenflis cum illii ar- 

 tic. 7- inuenta (atis obuius eft. Scilicet -quum fit c;^ - a* 

 ^ b^ ^- ^ab cof. 2 », prodii 



N ^ /' [a^ -+- i»' -i- ^'^ -^ 2 ^* ^ cof. n ;;) - L^ ^ r 

 -l^dl^iv^^c^) -V dr; 



-tumque 



4fl'^'J>]'fin.2v,'=r^>V^% ct ^a"- dy^* = ~r^yj--^- ^ 



eft cnim ^ fin. (0 ~ Cp) — i» fin. 2 ?;. 



§. 13. Iftud vero negotium ita quoque confici po- 

 teft, vt mox in aequationcs difFcrcntuilcs fecundi gradus 

 Joco d(^^ d^ introducantur diifercntialia ^77, d ^, erunt- 

 que tum aequationes ifiae: 



fl* 



