-2^.-§ ) 305 ( l?l- 



§. 26. Deinde in fecunda aequadonc occurrit ifta. 



fbrmula: i/^ + p-p; quia igitur eft 



v^-ffjip— «(v cof. CP + (JL fin. Cj) ), ob 

 {ji — fin. r fin. ^ — cof. i cof r cof. ^ et 

 V — fin. r cof ^ + cof. j cof r fin. Q, erit 



j' cof. 4) 4- fjL fin. 4) =r fin. r cof. (4>-^}-cof.icof. rfin. (4)-^) 



vnde noftra formula reducenda erit 



K jr 4- p. p rr « (fin. r cof. (Cp — ^) — cof. i cof. r fiu. (Cp— ^)). 



§. 27. In tertia tandem aequatione occurritt 

 p fin. ^ - p cof g^ — « (cof. 4) fin. ^ - fin. (p cof. ^) 

 quae manifefto abit in — «fin. (Cp — ^), ita vt fit 

 y fin. ^ - p cof. ^ := - « fin. ( Cp - ^ ) . 



§. 28. Quodfi ergo breuitatis gratia ponamus 

 (J) — ^ — vf^, ternae formuJae hic redudae erunt : 



m p + n Vfzzzu (cof. r cof. vjy -+- cof. 1 fin. r fin. \\j ) 

 V f + fjL 9 = » ( fin. r cof. v|/ — cof. j cof. r fin. vp) 

 y fin. ^ — p cof. ^ = — a fin. \\/. 

 Cum igitur porro fit 



', cof r cof. >4y — l cof. (r _ v|y ) + ^ cof. ( r + >!» ) ct 

 '' fin. r fin. vjy iiz^ cof. (r— \|^) — ^cof. (r + v{^}, 

 tum veio 



fin. r cof. vp ::= ^! fin. (r — vjy) -f ! fin. (r + v^) , et 

 cof. rfin. \i^rr-!fin. (r- vp)+;fin. (r+ v|>) 

 liis valoribus fubflitutis binae formulae priores fient 



w y + « p =; ^ w (i+cofi j (cof.(r-vl.) + ; u (i- cof i )cof (r+v|/) 

 vi: + ix.t} = lu (i-f cof i ) fin. (/ — vp) -f ^ « (i— cof. i) fin. (r+v^). 



f. 29. Quia denique eft 

 L+f£tl - cof. '; et '-^=1^ - fin. •" 



Aila A(ad. Imp, Se. Tom. 1. P. IL Q. 9 ^*'^' 



