) 103 ( ^H*' 



2Cor.^fA+B+C-D)cof{(A+B-C+D)=:cof.!(AfB}+cor.-iC-D); 



2cof.;(A-B+C+D)cof.: (B4-C+D-A)-cof.i (A-B)4-cof.;(C+D); 



tiimque 



cof.^A-B)-l-cof.KA-HB) — 2cof.^Acof.|B et 



^^ , cof. i (C - D) -f- cof. ^C 4- D; = cof. ^ C . cof. ; D , 



f fit omnino 



* • Jcof.i (A + B +C-D) cof.-: (A + B - C + D)^ 



^cof.i (A - B + C + Dj cof -: (B + C + D - A;S 

 r= cof. I A cof. |: B + cof ^ C cf. i D. 

 Simili ratione 



2cof. i (A-B+C-D) cof :(A-B-C+D) :r cofKA-B)!- cof.,^ (C-D) 

 2cori(A+B-|-C+D)cor.:(A+B-C-D)=cof:(A+B)+cof.^(C+D} 

 "vnde haec prodiidoriim fumma denuo 



=r cof. i A cof. I B -i- cof 4 C cof. ^ Dy 

 hinc ergo colligitur: 



fin.'Aliri.^Bfin.iCfui.AD 

 cof y I ,]-y^^^(A+B+ C-D)c.:(A+B-C+D)c.-:(A-B+C+D)c.'(B +C4-D-A) 

 "^ fiu.iAfin.^Bfin.iCfin.tD 



et denique 



^ -r j .[ ^"^'^''^-fin.^Aan.^Bfin.iClin.iD 



Caeterum relationes confimiles iis , quas artic. 34 recen- 

 liiimus hinc quoque deduci poffent, quibus tamen recen' 

 fendis non eft vt immoremur. 



SOLV- 



