-14^ ) 9* ( l?f** 



Ottod fi Inc pro ipfo variationum initio pofito 2= :o fiat 

 etiam ^ — o, ob cof a z — i, fm» az—o et cof. ftiz— i, 

 jjafcitur aequatio 



o — A -f- — -+- — r ■^'■nde colligitur 



^ ' aa * aa — mm' '-' 



A — — » quo fubftituto erit 



* a a o.a — m m ' '^ 



t=l- { I -cof a z )-f-c. /''/--"'J-g°^ 



Hoc igitur integrale prorfus congruit cum illo, quod in 

 iemmate fupra memorato aflignauit Cel. Frifiiis. 



§. 6. Accedat adlnic terminus d coL n z ^ feu pro- 

 pofita intelligatnr aequatio differentio - differentialis hacc '. 

 ±±t_ ^ aatzzib -{- c cof. m z-\~ d coL n z 



cuius fingatur integrale huius formae : 



r~ Acof. az -l-B fin. fl2t-|- C -h D cof tn z -l-E cof. ««. 

 et quia hinc poft duplicem differentiationem fit 

 *£?— — A d coLaz— B a' fuua s — D ;»' cof..;« s — Ea* cof ;; z 



tnm vero fit 



aat —-\- A a: coL az-\-B-a^ fin.as+D a^coUiiz-^^Ea^co^jiz-VCaa:, 

 erit termiiHis colledis 



t±l~uaatz:b-\- c cof ;;; z-^-dcoLnz—Caa-^X^ (a'-m^)coCmz 



-4- E («' — «' ) cof n z 

 vade concluditur C=:^^, D — -,^etEz:^^^i,itavtin- 



tegrale fiat :; 

 r—Acofffsr+B-fnr.ff5r 4-^-1- jf^c-o^^"^ '^-^^r—rCoCn z 



\hiy fi integralia iterum ita fa<fta condpiantur ,, vt pofita 



a: — o fieri debeat t = o r ^tit 



a — AHr4+-T-W+„-r-^ vnde fit 



A — — - — 5r-^ — — ~ r exiftente; B^o 



qttibus fubftitutis erit integrale cum eo> in altero) Lemmate; 



opei"is aUcgati contento conucniens 



