144 



METIIODUS TUTISSIM A 



investigandi su mm a m seriei 



A + B COS. Cp -h C COS. 2 (p -4- D cos. 3 Cp 4- etc. 



ex solo primo tciniino. 

 5- 3i. Quod piimum terminum attinet , is commo- 

 dissime determinabitur per hanc seiiem : 



{i-n^y 



— i '■ 2 a 



n . ^^^ '^^^-^ "» 



n' 



-H^.^7-^^--^;l^4-etc.J/ 



Ad sequentes determinandas statuamus brevitalis gratia 



2 X n A rtj 



B -<* * 



(X H- 2') n G ^ 



- D — V^ » 



(X -+- 3) TiD q^ 



E 



etc. 



etc. 



quo facto habebimus sequentes relationes intei' no vas lit- 

 teras SI/ 23, (î, 0, etc. 



23= 4 — 



(5: = 6 — 



2) =; 8 — 



(5 =: lo — 



^ 



20 — 



(loiiH-X — XX)rt« 



