ficque erit 

 ' fin. a 2 fin. b 2 fin. c 2 cof. A 



zzvv (cof. a -f-cof. 6-1- cof. c— cof.a cof.b— cof.a cof.c— cof.bcof.c) 



— cof. a cof. b cof. c -+- cof. a 2 cof. b 2 ■+■ cof. a 2 cof. c~ -+- cof. b 2 cof. c 2 



— cof. a cof. b cof. c (eof. a 2 ■-+ cof. b 2 -+- cof. c 2 ) + cof. a' 2 cof. b 2 cof. c 2 . 



f. 13. Quo nunc has formulas non parum compli- 

 catas commodius tra&are liceat r ponamus primo breuitatis 

 gratia cof. a — A; cof. b — B x cof. c = C } vt habeamus 



(i-A 2 )(i-B 2 )(i-C 2 )cof..A=:2;z;(A-fBHC-AB-AC-BC) 

 -ABC + AABB+-AACC + BBCC 

 -ABC(AA-+-BB-f-CC)>AABBCC, 

 vbi iam erit 



t; i> — 1 — A 2 — B 2 — C 2 ■-+- 2 A B C 



J. 14.. Quoniam hic temae litterae A 5 B, C aequa- 

 liter in calculum ingrediuntur., ita vt tanquam radices cu- 

 iuspiam aequationis cubicae fpe&ari qiieant^ ad calculum 

 contrahendum non parum conferet itatui, 



A-+B-}-C = P 



AB + AC + BC^a 

 ABC = R, 



hincque facile colligitur fore 



AA+BB + CCnPP-sd 

 xdeoque 



i;d-i-PP + 2 &+ 2 R. 



Dein- 



