(io) 



B = — H et a = '°- + " ,r ^i 



n n 



Nunc etiam angulos inter fe coaequemus faciamusque 



a+ap = ^ ft a+4|3= *-(0-+-2 tt), 

 vnde colligimus |3 — ^ , hincque porro 



a 



, — P 



f ( * ~ * 7T ) = — ±. ( 2 7T — $ ) , 



hocque modo fiet V = Q. At anguli in exprefllone ipfius V 

 occurrentes erunt: primo 



a+(2«+i)(3 = — XJtt — 0) 



vbi cum p fit numerus integer, poftrema pars 2 7rp, totam cir- 

 cumferentiam exprimens, omiffa eft, ex quo habebimus 



iin. (a-+(2«4- i) |3 = — fin. -J. (tt — 0) . 

 Deinde occurrit angulus 



a -f- 13 = — £ (7i — ) , cuius finus eft 



fin. (a-f-p)= — fin. -£-(■* — 0) . 

 Denique erit 



«+28(3 = ^^ 271 ^ et 



cof. (a •+- 2 n (3) zn cof. -jl ( 2 tt — 0) . 

 His igitur valoribus fubftitutis prodibit 



?JL±i>*=*]fin.-l (tt — 0WJL±l)*=>fin. -£- (tt — ) 



Q=V=- 



2fin.^ 



71 



2 7T fill. ■£- (7T 0) 



2iin. ^£ 



£2 cof. -£- ( 2 7T — 0) — 2 ^ cof. JL ( 2 rr — 0) 



n n v y n ti v y 



4 fin. 2L£! 



quae 



