210 EprSTOlA* 
Jiante a , '^^ a femtangulo infinhejtmo ^ . Fonatur itaque « 
a . ( ) ; fpecies k , m erunt deinceps dsterminand^s : ergo Jl poteniia' 
tum angulus 
2 d p 
, ^xcinivalem erit := 2 u — a . ( — — r } 
Fotentia^ CA^ CB, fmguU = a, efficiant angulum ACBzz^' 
r • 
c 
ducantur Ca^ Cb prioribus ^^^quales efficientes angulos ACa, BCb ~ 
ut angulm jCZ; — ^lill?. Dividant CP y CQ_ bifariam an- 
gulos ACa, BCb, m PCQ^^ 2p-{-2d<p ^ jE^^^i^alens potentiarum 
aqaalium debet exprimi p^r potenuam du5lam in funilwnem anguVt . feu 
femianguH ab ipfis eff-^^iii; qua funtlio expnmatur Uttera F . (^uare CM 
aquivalen^ duabus-C A^CB erit =: a . F . ± , ^quivjlens dujbus Cj, 
C b erit =IJ . F . tlh^_L2. : ergo aquivalem quatuor C A ^ CB , C ti , 
Cb erit =:a . F . -~ -i- a . F.2-^^~^ . CP aquivalens duabusCAy 
C a facientlbus angulum r= pojita eji — 2 a - a ( ) ' : idem dic 
r r 
de C(l_aqu\valentc duabusCEy Cb. Igituv qu<x aquivalet duabus CP , 
C(l, fcu quatuor CA^ CB, Ca, Cb fet-=z 2 a - a {'—^ f . F. 
r 
- . l^itur valebit aq^uatio F.^-hF. t±lAl - ^ - ( ) 
. F. 
<p -4— d <f> 
F. 
Jam vero potiatur F . — y ; erit F . l^Jll ^ jf — tf ^ d u , 
<p -f- 1 li (p 
: i/ ' — z/' — d i) — tj — 2dy d dy . His vaJnribtis /7r'''/z- 
y 
tmis aquaiio in hanc conuertiiur y-i~y— zdy-^ddy— 1— i ) 
