OpascuiA i 441 
— ttaf^gg — in^f^g^ l^^f^ — ^ ^^^i^ "~ ^^gg^^> 
Cotfficiens radicalis ^bb 
— aaf hh 7^^/' hh — lacf^ — — 2^^^^ — sch'', 
Coefficiens radicalis v^fc 
*— 6 cffgg h"^ l ^f^ ggh-^- i ^ffg^ ^ • Coefficiens radicalis 
*— 6 bffg^ hh ^ ^ af^ ghh-^ $c ffg h * . Coefficiens radicalis 
\/ aahcc , , 
'—6 af^gghh-h 3 ^fg^hh-h 3 ^fgg^'^ » Coefficiens radicalis 
\/abhc<Ct 
XV. Ex invento ( numero XII. ) reciproco formulae qua- 
tisor radicalium quadraticorum , facile tranfitus fit ad reci- 
procum formulac trium ejufdem indicis radicalium , modo 
coefficiens datum quarti radicalis , quod eft nihilo sequale 
fiat in valoribus cotfficientium , quos numero XII. retulimus. 
Nam formuia quatuor radicalium quadraticorum , fi unius ^ 
ex quatuor radicalibus coefficiens nihilo aequaie fit , evadit 
formula trium radicalium quadraticorum . Si in unoquovis 
ex cotfficientibus terminorum , quibus conftat reciprocurn 
formulx /v/ tf-f- g\/b -■{-hVc -^-kV d ^ ponamus k — o^ evane- 
fcent ex reciproco termini omnes habentes radicalia v///, 
s/ acd ^ \/ bcd y \/ abd , permanentibus tantum terminis, qui 
radicalia habent \/by \/ci 8z \/abc„ Quatuor igitur termi- 
nis conltabit reciprocum formulae /v^z? H-^\/^ -h/z/c, qui 
cum fint finguli per quantum rationale aaf^-i-bbg^-hcch'* 
' — ^abffgg — lacfflih — ibcgghh divifibiles, erit formulae f\/a 
^ g\/b -\-h\/c fimplicius reciprocum aff — bgg — chh X// a. 
H-bgg — aff — chh X g}/b-h chh — aff — hgg X k\/ ^ — ^fgh\/ ahc» 
XVI. In hoc ipfo formulac trinomialis fy/a -h\/b -h h\/ c 
reciproco fi unum adhuc cotfficiens alicujus ex tribus radi- 
calibus nihil evadat , tranfeunte formula in binomium f\/a 
•4-^/^, opus eft tantum in mox allato trinomii recipioco 
litieram hy coefficiens evanefcentis radicalis \/ci nihilo aequa- 
r. IIL Kkk lem 
/ 
