(77) 



§. 14. Pro cafii fecundo f-iciamiis primo « — -f- i , 

 eritqiie d x z=z ~ — £.3-_— et dr =z -. — — — ■ , vnde intec-rando fit 



jf — 1/2(1-1-1;) et.yzn — ■/-(' — '■^)^ ex quibus mani- 

 fefto colligitur x k -^yy — 4, quae vtique efl: aequatio ad cir- 

 culum. Sin autem fumamus « — — i, reperitur 

 ajf — '---^-'-^l^a-i; et 



aj^^i- 





>' 2 ( I V 



hinc autem circulum enafci fequenti modo facillime oflendetur. 



§. 15. Hunc in finem flatuatur v =: cof. 2 (J), critque 

 Tifo — — 23cf)fin. 20 et /2(i-j-i;)=r:2 cof. 0, fimilique 

 modo /2(1 — i;) — 2 fin. Cp. Ergo pro priore formula erit 

 , ^*" — — 2 5 (t) fin. Cl), alter vero flidlor fiet 



— I — 2 cof.- 2 Cp — 4 cof. 2 0* 



— I 2 COf 2 2 COf 4 



quamobrem habebimus 



Bjf— 2B0fin. 0(i-+-2 cof. 2 0-1-2 cof. 4 0). 

 Confbit autem effe 



a fin. cof. 2 — fln. 3 — fin. et 



2 fin. cof 4 =: fin. 5 — fin. 3 0, 

 quibus fubftitutis obtinebitur 9 .v 1= 2 5 fin. 5 , culus inte- 

 grule efl jr ~ — ' cof. 5 0. Simili modo pro altera formula 

 prodit ^-^- — — 2^0 cof. 0, alter vero fador erit 



1 -+- 2 cof 2 0—4 cof. 2 0* — — I -(- 2 cof. 2 0—2 cof 40 

 ficque fiet 



5j z=r 2 3 cof ( I — 2 cof. 2 0-1-2 cof. 4 0). 

 Conftat autcm effe 



2 cof. cof. 2 = cof. 3 -h cof. et 



a cof Cp cof. 4 cj) = cof. 5 0-1- cof. 3 0» „' jo 



K 3 qno- 



