= 122 SS 



atque habebimus 



fin. (a -+- 13) ~ ]/( i — mm) , 

 fin. (a — (3) — ]/ (i — ?i rc), 

 cof. a cof. (3 = ^p , 

 fin. a fin. (3 



n —■ m 

 — -; — 9 



fin. 2 a fin. 2 |3 = n n — m m. 

 Cuni igitur fupra J. 29. inuenerimus 



T) r y H -4- lin. 2 - / /*.. 2 (3) 



jzu.2 ji»! 2,i ' 



fada fubftitutione erit 



T) r V I 4- n n — 771 m) 



n n — m 77i 



Notetur autem effe 



T/-A r V I — 71 7i ) 

 U ' n~nL ' 



To 



n — m 

 r(nn-+-7nn' — I) 

 n n ■ — m m 



vnde porro conficitur 



/-1 -pv r •/ ( I -4- wt m — n n ) 



^ ^ ■" n 7i — m~m 



Cum igitur fit 



RT> r_r (I -4-nn — mm) 

 x *• (n n — m m ; s * 



•p. -p. r r ( I -->- m m — Tt^nJ 



■f ■*-' (iin — 7n~m) 2 * 



perfpicuum eft fore 



vnde iita aequatio elicitur 



(RR- DD) 3 = 2rr(RR-hDD) 



ex 



