-i- 4 F C xf (x-^j) -+- 2 B D ATjK (.V + jY 



-1- 4 B F (jr 4-.y) Jr xjj -\- ^ C C X xy y 

 ■ H- 4 C D (jr -f j-) Arjrj/ -j-sCE jr' j' 



D D :v .V j jK (jf + j)' -i- 4 D E a;' j' (^ -f j) 

 4 E E .V* j* 



§. 42, Qiiod fi Jam pofterroreTn formnram a prf- 

 ore fubtrahamus et {ingulos terminos ordins analogos dis- 

 ponamns, reperiemns 



4XY-VVrr4AC(jr-j)'-|-4AD(A-+j) {x~yf 

 -^ 4 A E (jr +^)= (:*: -fr - B^ (x - yY 

 -}- 2 B D jf j [x -yj -f- 4 B E xy (x -f J') (x - j)-' 

 -^ 4 C E A- xyy (x -y)' - D D jr xyy {x -y)' 



qtiae expreffio faclorcm habet commanem (x—y)', per 

 qirem cpgo fi dinidamus perueniemus ad hanc aequatio- 

 nem concinniorem: 



4 A C + 4 A D (A-Hry) -I- 4 A E (j^ -^y)' - BB 

 -f 2 B Dxy -f 4B E ATj (jt -fj) Hr (4 C E - D D) xxyy 



— VY [x-yY _4rA-2rB(Ar -f j') - a,T C x y 

 — 2 r D jc j (j: -f j'] — 4 r E at jf y y. 



§. 43. Transfeiamus nunc omnes ferminos ad 

 partem fniftram et loco [x-\-y)- feiibamus {xx-^-yy^-^-vLxy^ 

 tuOT vero \Xx-\-yy) — 2. xy loco {x~y)'\ quo fado ralis 

 ©ritur acquatio meae canonicae refpondensj 



f4AC-f4AD>-fj')-|-4AE>'-fj'')-f2BDjrr4-4BEjf>'(jf-h>')-f4CE.vj»-^;' 



o =:j-BP-f-rC(jt:-}-j)-r r (jr^-fj^O-HSAEjrj-f^rDj^rXjc-f^^-DDjc.yvy 



C-h^rA H-2r'jiy, -^^TExxyy 



-^-^TCxy 



§. 44- 



