167 
Tum quo exponatur forma, quæ pos. u niimerice — 1 ae- 
quationibus hisce contingat 5 quoniam semper loco ^ — 
substitui licet Tg^ atque loco l-f-Cosir substitui 2Cos'^^^, 
patet membra earum priora pos. m — 1 abire in 
I 
-v.ArcTg(Tg^) 
et 
W\ 
-i',ArcTg(Tg- I 
O' 
.|^2Y'Cos2^j Cosj^log^sy'cos-^j -[-/iArcTg(Tg*0 
.^2'y'Cos2^) Sin |^Iog^2'|/Cos‘'^j +fiArcTg(Tg^ 
ideoque posito 
IV 
2 
= ArcTg(Tg-^j 
quoniam relatio Tg— —Tg— dat Cos-^ — 
2 2 2 ' 
Cos^-, patet æ- 
2 
quationes (II) pos. m — i abire in 
2'‘Cos'‘^Ç^^.e-’'(T)cos 
log[2’'Cos’' + '* (^) 
. ^.(IV 
2 Cos 
Xr) 
. e-^ (T> Sin r Iog[2”Cos" (^^)] + f (f"' 
)] = 
n=03 
S 
:'V['*e/][-fc)-j 
Sinj^ mr+A.Tg-+A.Tg — + . . . . 
/4-n+l ^ J V f* 
• » • ."hA 
Tg— ; 
V«+v 
30 
