f. 8. In hac iam expreffione omnes quantitates , 

 praeter B, funt determinatae; ifte aatem coefficiens B ex 

 conditione Minimi definietur, dam fcilicet differentiale areae 

 minimam efficiendae , fpe&ando B ut variabile , nihilo ae- 

 quatur. Hinc emm refultat ifta aequatio: 



His valoribus in aequatione U.-\-~ — 2J — o fub- 

 ititutis, prodit aequatio (§. 2.) 



Ax 2 +2Bxy+C/ 2 +2Dx+ zKy-^-Fzzzo, 

 exiftente 



j^ __ coj. y* , Jat.y . 



f f 9 9 y 



B ___: c °j f - 7cqJ- (7 + ^) _i- J in - yf in - (7+-^ ) • 



f f 9 9 ' 



C C3 S- (7 -+.> ] Jin. C7 -+- Qa . 



^ --t" - j 



T\ m coj. y : n fin . y . 



~n~ " ~ ~~eJ~ * 



T£ m cof. \y -+- f) n/ri.. (7 -4- <) .. 



ff S9 8 



F __ mm + nn __ , ^ 

 ff 9 9 



Hic ftatim quafi fponte fe oiferunt Xequentes- combi- 

 nationes : 

 ^ I. AC-BB=:M; 



f f 3 & ■* 



II. A fin. (y+-£)cof. (y-+<f)-+C iin.ycof.y=Bnn.(2y-+-^) 



III. A fin. (y -+ <) 2 — C fin. y 2 ^^-^ 1 - 



IV. A cof. (y -+- IJ — C cof/y- = __./^j^.^7-4-^u 

 V. D fin, (y -+ l) — E fin. y ==. — =^i; 



VI. D cof. (y +- £) — E cof. y :___ -+ "J^. 



Ex 



