( ^3 ) 



a-bp-^bq V^i^cp^ — cpqV^i - q'^zz^^ — (^Jj^Br^p 



'+(J'i'Br^qV'^i+Bp'^ -QpqBV^t-' Bq^. 



Quae fi primum addantur, turn fubcrahancur , hasce fup- 



peditant aequationes : 



a-bp + cp*-cq^ zzAr - {J-^B r')p + Bp'^ ^Bq'^ (10 



hqV^^i — <icp qV^izz(^A-^ B r^ qV^i— %p B qV^u 



Quae posterior, fl dividatur per: qV^ii fic 



h-icp^AArB(r-^p^ .,•.... Q\)i 

 Aequatio (I.^ firaplicior fic, fi ei addimus aequationeiri 

 (IL) niulciplicatam per ^5' turn enim fit: 



a- cp^ — tq^zi^Ar-'Bp'^'-Bq*. 

 Ex his duabus aequationibus inveniuntur: 



et B = 



fi'-^ h r -- c r/>* — 2 ^ r -4" ^^^ 



2i> -{/>*-*' ^*4t*) 



JP invenitur 11 in aequatione: uj^bx-^cx^ rr (^A^B'jc^ 

 (jx;j^ry^P(x'^'^^pxj^p'^'¥q^^ pomtur x=-r, turn 

 enim est: 



a-hr-^cr^ztP (?•* - ^pr H->^' 4-^*> 



/« — -^r + cr* 



S XIX. 



Generatim hoc in cafu ica decerminare posfumus A ezB- 

 c-r ^^ - ^-^ ^-^ J, :^ 



^" (r* + 2 /> .V + /)* + ^*>5' *" .\^ + 2/) r +/)* + '/* ^ ^ 



itim 



