[ *8i ] 
Qoippe cum fit generatim pro quovis angulo A, 
fin. A • » I r> fin. A -f- B 
tang. A = cat tang. A + B = —=== = 
6 col. A ° cof. A + B 
fin. A x cof. B - + cof. A x fin. B fin. A x cof. B + cof A x fin . B 
cof. A x cof. B — fin. A x fin. B 
cof. A x fin. B 
cof. A X fin. B. 
tang. A , 
^ cof. A x cof. B — fin. A x fm. B — tang. B 1 
X 
tang. A + tang. B 
1 a 1 tan S* A x tan S* B * 
— — — tang. A 
tang. B * 
Simili 
. , a -r> tang. A — tang. B , 
calculo prodit tang. A — B = ; + tang .,A xTani^’ 
Unde ftatui poffunt, 
-r — ; — rr tang. A + tang. B 
i°. Tang. A 4- B =; 2 r— r 
\ i — tang. A x tang. B 
tang, 
tang. A — - tang. B 
2 °. Tang. A — B = 
o i + tang. A x tang. B 
_ ^ A n tang. A + B — tang. A — tang. B 
3 • Ta °g- A x ta "g- B = ^"aTb > 
vel tang. A x tang. B = tan fi. A - tang. B — tang. A — B. 
6 6 tang. A — B 
Coroll. II. 
Erat in lemmate A — — ~=> unde eft A ^ — i 
X V I 
“ log. X. 
Denotet igitur E numerum cujus logarithms 
hyperbolicus eft i, eritque E Ay/-i — .v, et cum fit 
x — c _+ cc — i, inde obtinetur c = cof. A ~ 
- E" A /~ 
„ r a E A *" : 
T 3 atque fin. A 
y'—i 
Vol. LIE 
Oo 
Sunt 
