->l^.| ) 345 f ^<- 



(c' — r) (a {c' -f- — ^ ^O ^i"' f ^"' ^ 



- cXc'- d){i- cof.5 coLi) -c*Xc-a) (t-coC.e cofi) 

 4- r t' (r + ^' — 2 fl-) (2 — cof. 5 — cof. e) — o 



lam fi ad hanc aequationem fimul addatur et inde fub- 

 trahatur 



c c' (c -^ c' — 2.a) (i — cof. e cof 5) , 



crunt termini per (i — cof. e cof. S) muhiplicati 



—c' (c'-{-a) (i- cof £ cof.5) - c" (c-]-a) (i- cofe cof.5) 

 + ^ <^' (^ + <^' — 2 o) (i — cof. e cof. J) , 

 qui crgo contrahuntur in iftum terminum 



-\-a(c'-cy(i-coCdcoC.e)y 

 deinde rehqui termini erunt 



cc' (c-\-c'-2a) (2 — cof. 5 — cof e — I + cof. e cof J) 

 — <:<:'(£• + (•'- 2 a) (i — cof (J) (i — cof e). 



Hinc tota aequatio noftra fatis concinue hac ratione ex- 

 primetur: 



(c'- c) (a (c'-\-c) -cc')Cm.^Cin.e-\-a (c'-cy (i- cof. J cof e) 

 •^cc'(2a — c' — c)(i — cof 5) (i— cof e) — o , 



cx qua iam dato angulo 5, angulus e inueftigari poteft 

 et viciflim, 



§. i6. Hunc in flnem aequafio nortra ita euolua- 

 tur , vt illi termini feorfim tradentur qui incognitum 

 angulum 5 continent, quo fado erit 



(c'- c) (a (c'-\-c) - c c') fin. 5 fin. e - a (c'- c^ cof t cof B 

 -}-2cc'(2a-c'-c) fin. ,' e' cof B + a (c'-cy 

 -2cc'(2a-c-c'){in.le*~o. 

 A^a Acad. Imp, Sc. Tom. IV, P. 7. X x Nunc 



