->|3§ ) 59 ( "^' 



Subflitiiamiis niinc in his forn iilis valorcs pro -y ct V iii- 

 ventos; ac primo erit 



T -i- »• »■ c r. (<-i-PP1l'l' ■+- rrpp'^ (i, -+- r rqqPf — -rrp^FO 



1 -^ 7 / V 4. _ (, -t_ p p , ,j^2 --, 



quac acqiiatio, fi Joco PP ct QQ valores rubliitiiantiir, 

 ad hnnc rcducitur: 



(' -+- P P 9 9)^ 



At vero pro numcratore crit r 



;• V -J_ /j,» R — r{j—pp qii)PQ, --Pqr ( pp + .)q ) +f.?PR - PQ.R; (■4-f p qj) 



{' -i- P P 1 1)^ " * 



confequcnter abfcifla quaefita C S =: J ita erit exprella: 



f — rfi —ppqq) Pg-H ap(;r rpp + qq] H- (?PR — ;>0R) f. + ppnq) 



Quod autem ad valorem litterae S attinct, quia eo in nr,- 

 Iho calculonon indigemus, eius euolutionc iupcrfedcnuis. 



§. 41. Hinc igitur videmns, quomodo abfcifra s 

 per tcrnas .ib!ciflas datas p , q et r exprimatur; vbi qni- 

 dem plurimum abcfl, vt litccrae p, q, r in cam acquali- 

 tcr ingrcdiantur : cum tamen ex aequatione propofita 



: j — : r -h : y - : p 

 intelligatnr , iftns littcras P, Q ec R fimili modo in va- 

 lorem iplius s ingrcdi dtbcrc, W modo littcra p ncgatiue 

 acciptrLtur. Ncquc igi;nr vlUmi cil dubium, quin forma 

 inuenta ita transformari poffit, vt ifta paritas littLrarum 

 p, ^ et r elucefcat, id qnod tamcn neutiquam liquct. 



§. 42. Cum autcm efTc debeat 

 0:j~0:r-f0:/7-0:/>, 



H 2 eui" 



