ent 



{- 



J. 20.^ Sublato [iam termino XY aequatio noftra 



YY[cccof.(d — (I)f + aacof.(p^jS"" ' 



rnde ambo femiaxes principales, qui lint / et g, fequenti 

 modo definientur: 



/ f — - aac cfin.ii Ct ^ ^ ca ccfin.S* " 



J J c cjin. — cP)a -^ a ajin. 4)a & o c c coJ.(& — cpia -+- « a coj. (J)»* 



iicque erit 



^^.^jf^ = ccrm.(^ — (pf-haarin.(if et 

 "'^'^'^^'"^' = c c cof. (^ _ (I))2 4- a a cof. (P^ , 



o o 



vnde ob iam inuentum angulum (J) ambo femiaxes princi- 

 pales / et g determinari poterunt. 



J. 21. Si duae poftremae aequalitates addantur, 

 orietur ifta aequatio: 



aaccjrne^ifj-^gg) — g g ^ g g flUe 



fJSS 

 ff-^gg — - a a -4- cc 

 Jfgg a ac cjm.&2 



Deinde vero ii in prioris aequationis 



''^y/"-^' :=cc fin. (a — (p^^H- a afm. (I)^, 



membro dextro loco cc fcribatur valor r-^-^^^-#^> prodi- 

 bit haec aequatio: 



c cjin^ Jin.^coS.(pjin. (fl — (p) _j__ ^^^^ ^2 



// co/.(0 — Cp) 



Jin. (p [coj. cpjin. (fl — (p) -^-/m. (p cq/. ( g — CP)] /fn. fin.9 " 



coJ.{& — $) eoj.(S — (p)' 



ficque erit L£^— -|^^. Tum vero fi in alterius ae- 



jj coj.(9—q>) 



quationis 



^.^ii^ — c c cof. (e — (;>) 4- a a cof. (J)^. 



mem- 



