•4^1 ) 98 ( S-?S-«- 



-f- g cof. c t fiet differentiando : 



^ — -4- <^ f cof. c t — c g Hn. c t et 

 ''i^ — — r f /"fin. <r f — i- 1- ^ cof. (T t 



quibus introdu<^is erit 



dl» 



-i- 2 /« j5 -t- ;; s zi: — r f /fi n . r f — r r ^ c o f ^ f 



— 2 m c g fin. c t -{- 2 jn c fcof. c t 

 + «/fin. t- r + « g cof. <,• f 

 quae forma cum aequari debeat parti dextrae aequationis 

 propofitac : a fin. c t -\- b cof c t, nafcentur inde hae duae 

 aequationes : 



I. {n — c c)f~- 2fn c g— a 

 II. (n- cc)g+ zmcf—if 

 ex quibus binas incognitas / et g commode afllgnare licec 

 ope harum combinationura: 



l(fi — cc)-i-ll.2mc et U. (n — cc) — J.2mc. 



Cum enim inde fiat 



f (n — cc)*-\-^mmcc)f—a{n — cc)-\-27ncb ct 

 [[n-cc)^-^-^mmcc)g—b[n — cc)—27naCy erit 



r a(n_cc)-^»mcft ^f o- h{n—cc) — rmca 



J — (n-cc,='_+--v"^"T7"c ^'- 2 (n-c.;»H-4mmcc 



•quibus inuentis integrale compktum aequationis differentio 

 differentialis propofitae erit 



z — e-""{Ccof.-ht-\-Dfin.-Kt)-\-ffin.ct-i-gco{.ct 



Tbi litterae C et D funt conftantes arbitrariae pcr dupH- 

 cem integrationem ingrelTae. 



§. 18. Quoniam autem , fi valores litterarum / et 

 g fubftituti intelligantur, intcgralis forma minus concinna 

 prodit , ad eam fimplificandam pauca addamus. Ponatur 

 igitur grz/tag. ^: tum enim erit integralis pars alcera 



T =/fm. c t ^-/tag. ^ cof c t - '-^^^-^- 



Cum 



