50 



§. 11. Suinaimis ii^iliu P zi: Q/; tt Krz. — Si;, alque 

 nobtm acqUiUio induct liane foriiiam : 



-f- idt) — Ox , (. J — 2 as 2;î; {^^J 



dO /dz\ , dS /âzs „/-^o / èdz ^ 



— ^^ Byid,) -^ ^ ^ h tu) -^ 2 as Z^Z^ (,,,„) , 



si^'e 



(jnae aeqatio tribus tanuim mcmbris piincipalibus constat, 

 scilicet : 



§. IC. Ciim igitiir sit P := a^^ et R zr: — S î;, eiit 

 ôt :::= a (^■')x -f- c^/) et 5u :z:i S (d^- — i'^x); iincle patct 

 quainitalcs a et S ita accipi debere, ut hae duae foniui- 

 lae intcgiationem admittant , id quod a valore v potissi- 

 nium pendet. a^io igitur a simplicissimis incipiamus. sii- 

 inamiis 2;z=;o, capiqiie potcrit tam a^:^ l quarn S i=: i, 

 unde fit P zz: a et R in — a; qiiibiis positis acqualio no- 

 stra erit ù,aa Q^^^^ — Q, sive (^^^fjrzo; qua ergo bis in- 

 Icgrata habebimus tzziox-l-/ et t*==^/ — f'^- 



§. i3. Ad acquationem inventani {~-t^^ ^^ ^ intc- 

 ^randani statnanius (^) :^ j , fieiqiie (^^) zn o, iibi sola t 

 vaiiabilis accipitui ,, cxistcnte \i constante, quare integrando 



