dix eof.yi -f- J dy fi'. Vj cof. $ -t- ddz fii. fj ■i'^. d J" = - ,'.1 '■^* j- J Q^ fm.y n 



' ' '^^ d T- ■ ' " ■ a t' 



^^ _ A (t> co/. >i ' -f- ■!> fitt. y)"- c oj. <t^ +v^ JHri . V)? f;n. $') . B uooj.tcol >) 



• " ~ ■1,3 't" „J 



B(vrM.vi'co/. (p ' -4^t)i;n.y)- f;".($) - ) 



_A_ 1 B u cof. ^ cof, rj E T^Jt" . vi* 



Quum igitur fit 



C A : C B rr fin. C B A : fm. C A B; 



id ert c' fin. yj — u fin. $ ; et 



cof. (7; -i- d } — cof. j/ cof ^ — fin. ;/ fin. d , 



inde colligitur: 



ddv- vUi.^^^ ^d^--f iKr^ := - A 4 ^ (cof. cof. 7; - fin. fin.?/) 



^ A . Bcof. (y] -j-9j 



— 0,2 "T" u» 



Similique modo obtinebimus: 



* 



§. 4. Qnum fit 



'f — .v' H- ^' -i- ^' et u" " ({' H-j' -f- z" , hinc 



^ya^-y — A^^A^-l-jr/j + s^/z et 



udu — t dt -\-y dy -\-z dz\ 

 fi aequationes diffcrentiales §. 3. allatae refpediue multi- 

 pliccntur pcr </ .v, ^/j', d z ct carum lumma capiatur, con- 

 lcqucmiir: 



dxddx-i-dy d dy-i-iz ddz _ __ Ajx^xj-j-yd_y-^-zdz) _^ ^{tdt-i-ydy+zdz] 



(IT^ — u^ tt' 

 A -? 1) B J u . 



hincque integrandn: 



tl T» ^" """ V V ' U ' a ■' ' 



ideo- 



