D I S QV I S I r 1 0. 2^9 



Pro numero reflex. i, ^ — 2(20-(j)) 



2,^—71-2(30--$) 



3,^-27r-2(4$-Cp) 



4,^-2(50-(J))-7r 



5, ^=2(60-4))- 2 71 



5,^— 37r-2(70-C})) 

 7,.^ — 4.7r-2(8e-C})) 

 8,<=i2(90-(I))-37r 

 9, -^:::^ 2(io0-(I))-4.7r etc, 

 Ex quibus flicile patet , quomodo illae vlteriu* progre- 

 diantiir. 



3p. Ex his fbrmulls particularibus iam facile ge- 

 nerales deduci pofllint. Nam nurieris reflexioniim 

 I > 4 ) 5 » 8 , 9 etc. refpondent valores anguii ^ re- 

 fpeaiue 2(2e-Cl)), 2( 5 -Cf)) -7r , 2(6$ -Cp)- 2 tt , 

 2(90 ([))--37r, 2(ioO-Cp)-47r, etc. at numeris 

 reflexionum 2 , 3 , ^ , 7 etc. refpondent fequentes 

 ipfi'us ^ valores 7r~2(30-C|)), 27^-2(4.0—^!)), 

 37r — 2(7d-C|)) , 4.7r-2(8 O-C])) etc. Vnde colligi- 

 tur , ii numerus reflexionum quicunque datus , cuius iu- 



dex eft «, fit huius formae i -H^^)- ^-^^^V'-^- 



_i£ilrz^)^:l5L«-)._etc.vbi A = ^, Bzr"-^^ 



Cm^^^— etc. , quam breuitatis gratia P vocabo , fo- 

 re ^ n: 2 (( I -i- P) $-Cj) - (« - i ) 7r. Si vero numerus re- 

 flexionum datus in hac torma Q.— 2 -h"-7-^-|-^^~^-^ 

 _^0_^ .C(^^4)_ >.iD(£r-) _^ etc. Vbi A - "-^' , 

 g__A£«^_^, ^__B(jt^) ^^^^ ^^^ commiis, et eius 

 index =1«, erit <^-K7r- 2(( i 4-Q_)0-Cp). 



Ll 3 40. Vt 



