\ 



Deinde notetur formulam (i — A 2 ) ( i — B 2 ) ( i — C 2 ) effe 

 produ&um ex his duabus formulis: 



(i ■+■ a) (i -+. b) (i -+ c) = i -4- p -+ a-*- R, 



et ex 



(i-A)(i-B)(i-C) = i-P-+-QL-R. 

 ficque noftra aequatio hanc induet formam: 



(i-t-P + Q+-R)(i— P-+-Q — R)cof.A 



=z(i-pp+2a^2.R)(p_g)-R+aa-2PR-R(pp_ £ Q^) 



+ RR 

 cuius membrum dextrum euolutum dat 



p_Q_R_Q^-+.2Pa+,RR-p 3 -+ppa-ppR, 



quod per i — P + Q. — R diuifum praebet quotientem 

 P — a -R-4-P'Pj confequenter noftra aequatio hanc in- 

 duet formam : 



(i -4- p 4- a-+- r) co£ a —p — a— R+PP. 



§. 15. Ha&enus igitur dedu&i fumus ad hanc ae- 

 quationem: cof. A ~ p ~ ^Z^^k > vnde porro colligimus 



* +*of A = ^M^r = 2 c °£i **• 



confequenter habebimus 



cof. i A = 



i-+-p 



y 2 ( 1 -+- p ■+- &,+- R ) ' 

 Cum igitur fit 



i-l- P -4- a-KR =(i-4- A) (1 ■+■ B) (i -4- C) 



— (1 •+• cof. a) (1 -+- cof. b) (1 -+ cof. c), 



angalis dimidiis introdu&is erit 



i+P 



