Tum vero facile liquet pro fin.^(B-4-C) et cof.^B-j-C) 

 casdem prodire formulas ac hic pro fin. ^ (A -f- D)^ 

 cof. *(A-t-D) eliciiimus, ex quo rcdditur manife(him effe 

 A -H D — B -t- C , quod etiam alioquin fponte patet. 

 Hincque demum fit 



fin. KA -H B + C -{- D) i:r fin. (A -f- D) 



r:2fin.i(A+D)cof.KA4-D)-- ~-l^_t!_ . 



coi.iacoi.ibcoi\iccoi.id' 



§. 34« Si vfus adhibeatur fequcntium formularum: 



t? .g-y^"- I(g-^->-^+^)^n(^+^+^-fl)cof.i(g-^-ff-^)cnf^^g-^ -f+^) 

 fm.l{a+h+c--cf)\.i(a+i>-c--]-d)cQ(a+d-^i--{-d)cQ^a+b-c-(i} 



tg.i D -y fi"U^-^+^+^)^^-:(g+^-^+^)c r-:r^-^+^-<?)cr.i(z>-f-//+^) 



fin.-l{a+b+(;-d)Ci.i{b+c-+d-a}c.-l{a-d+(;-^d)cl.l{a-b-c+dj 

 tg.i C -y^" -X'^+^^+Mf-:(^+^-f+^]cf^(fl-^+f-,V)cfi(tf- ^-f+^j 



fm.^(«-Z>+f+r^)(.^(£>4-f+^-^)cr.;(^-K^4-f+^jc.^(a-i-Z>^^-</) 

 feqiientes inde eliciuntur relationes: 



.ang. ; A tang. ; B tang. ; C tang. I D = 'J^^fZ^], 



col.^[a-\-b-i-c--i-d}' 



. tan^ l A tang. l B _ fin. lib-\- c-^d- aY ; ^ 



tang.^ C tang.iD ~~ ^\ {a -\- b - c -{- d) 



tan 



g. ; A tan g.^ C _ {in.\{ a-\-b-\-c-d,\ 



tang. ■ B tang.5 D i\n.\[a — b-\-c-{-d)'' 

 I , fane:. 5 A tang. iD __ cof.\[a -\- b - c - d)* 

 tang. 5 B tang. 5 C cof \{a ~ b — c -^- dj'' 



ABa Acad. hnp. Sc. Tom. VI P, /. M Hinc 



