246 
Jam $i formula ( 1 ) a formula (3) auferatur, prodibit 
— l 2\h 
/ ” log tang Ax . dx 19 l- — e l 
— F+î* = s ,os ‘ (_ r r ^Â ) 4 • 
l -f-c 
* 
atque si ( 2 ) et (4) addantur, obtinebitur 
( 5 ) 
/"" a: Cos 
t/ Ai 
sec 2 Ax . dx 
-2\h 
TC e 
A 2 -+-X 2 
-4AA 
1 ~ t 
A 
vel, si in hoc ultima A mutetur in — 
3 
j ji » -> 
* Cosec Ax . ix 
A 2 -J- X 2 
-AÂ 
57 £ 
-2AÂ 
1 - e 
Formulas hasce omnes ( 1 ), ( 2 ), (5), (4), (5) et (6) ex di- 
r ' ' 
recta serierum consideratione BidoNni primus invenit; easdem 
autem nos ex principiis omnino diversis demonstratas heic de- 
dimus. 
■ ;' r tt <>! ; 11 • i :.Oi X ir. 1 ! 1 HfH ?!!(. •>';->!> . ; 0 107 m«t 
§•5. 
Sit jam 
.. r * •/ \ \ i r> - i ^ \ 
„ tn n 
F (a, b) ~ a . b 
a == a == 3 = + 1 i /3 = — I ; 
fiet per transformationem rite factam 
P = 2 1+, " +i ’ (Cos-)”' (Sin — )” Cos 
2 
