vnde quum fit 



_j — j _i_ tane- d'* — c — ^c ■» cof. k co': j -f- y* cof. x * 



fiet 



^ ^/ — i^ d 9 eo/. X (e c»f. 9 — tj cgr. \) 



c^ — 2 c 1) cq/. X co/. ^ _j_ t;» cj/. X' ' 



Dcinde ex variabilitate ipfiiis "y, confequemur: 



cq/.5" c — ■Uuo/.X co/.J '" (c — u coj. A >-<>/■.*;* " (e — w ^.q/. A toj. dj»" 



</ 0' ZT c d •u.c b/. X/"^.g 



C- ^ 2C V COJ. X CO;.S -t- v^ CO/. X^ * 



Denique ex variabilitate ipfius X obtinebimus: . 



_d$' vd\fin.\ fin.d t)M X /m. X co/. X fin. 9 c o f. 9 f.„Q 



coj.i'' c — V co/. X cof.9 (c — V cof.\ coj.S)*' 



d6' — V d \fm .\fin.e -j. 



coj.O'» " — ■ Cc — 1» cof.X cof.9)' 



j A/ c V d, \ fin.\ fin .i 



— c= — 2 c V cof. \ cof. S -+. v cof. X' * 



Hinc coniuncflim fumtis his difFcrentialibus fiet: 



4^1- 'odOjf^ (^. ^^^ ^ _ ^ cof. Xj + odvcof^Jin.t 



- iJL^ . fin. X fin. t 



§. 5. Niinc pro dctcrminando difFcrentiali ipfius 

 X', difFerentietur aequatio fin. X' =z ^ fin. X, ex quo fict: 



</ X' . cof. X' - ?i^-^ fin.X-+-'^cof.X, 



tumque ob u cof X' ~ «' erit 



dV=z lAl^Jb fin. X + ^ cof Aj 



hinc quum fit 



u^ — c^ ^ v^ — 2.C V cof. X cof. 9; 



prO" 



