Subllituto aiitem valore pro cof. 1/^ ex §. 31. fit: 

 (cof. -: f - cof. ; {a + dr) (fm. ^ a fin. I ^ + fin. \ b fin. 1 

 := fin.lfl fin.i^(cof.K^+^) cof.K^"^)- cof.Ka+</)0 

 + fin. ^ ^ fin. ^ c (cof. l {a+d) cof. ^ (a-</) - cof.^ Ca+dy^ 



Hinc quum fit 



cof. i (a - ^) - cof. 5 (a -i- ^ — 2 fin. ladn.ld, ec 



cof. t {b- c) — cof. t (^ + <;) =1 2 fin. ^ ^» fin. ; c, 



fiet 



(cof.i/'-cof K^+^y) (S\n.\a fin.i^+ fin.t^ Cn\.\c) 



- fin. i a C\n.\d(coL\ (b+c) cof.\(b-c) - cof.i (^a-\-d)' 



+ cof i (a+^) cof. i (^-0 - cof. \ (a+d) cof. i (^+O) 



-fin iflfin i^5<^o^-K^-0-cof.i(«+rf)? 

 - *'"• ^ " ^'"' ^ "^ ?cof. I (^ + 4+ cof.i (^ + ^) S 



-^^'"•'^''^'"•^'^^ofi((7+^+c-f^)cof.K«f^-M5* 

 Simili ratiane eft; 



(cof. i (a - dy - cof. if ) (fin. 1 a fin. ' ^+ fin. i ^^ . fin.i r) 



- fin.ifl fin.-^ ^(cof.i (a-^)'-cof.i (b+c) coQ (b-c)) 

 + fin. i ^ fin.i c (cof.i (a~dy- cof i («+</] cof. («-/^)) 



— fin.i a fin.i ^/(cof. i (a—dy — cof.i (^S^+t') cof.i {b—c) 

 + cof i (a-^) cof i ib~c) - cof i (a-^) cofi (^+O) 



=fin.i«fin.i^5^«;;i^^-j)7^«^:=(t+o^ 



Ccof.i (a-^)+ cofi (^-^jS 



-^ '^ ^ ?co(.i(«+^-^-^jcof.i(^-H^-4' 

 Hinc bina haec produdla colligendo fiet 



L 3 (cof. 



