C O R F R I S. -&:^s 



Qmrt ex §. 15. neccfle eft, vt fit ^-^J^^-r-i, 

 ideoqiie P -j- Q^n o , Yiide eflTe opoi tet 

 X A ^ B ) ( col. <^ H- cof. V) ) -i- D -h D cof. ^ cof. -^ 



-{- E fin. (^ fin. -v) :^ o 



^bi condantes ita fimt dcfinien^ae , \t haec aequatio 

 conueniac cum nauira cllipfis tang.i^.tang s^l^w-r^j 



feu hac ^^ il' -"'- = "^-^- <^"«^ ^^8" fit 

 fin.^fin.v,-^^^^^"^^^^ hoc valore ibi fub. 

 flitnto fit 

 w( A + B ) f cof ? 4- cof vi) 4 mT) 4 wDcof <^cof ^i ? _ 

 — E ( col ^4- cof -vi ) 4- E + E cof ^ cof. vi S ~" 

 qnocirca hae conditiones requiruntur , vt fit 



E'w(A4-B)etD = -|=-A-B,hincqueEz:^^^(A4-B) 

 -et C-D-^E = ^l{A-^B). 



31. Vt iain tnotns rationenn in hac ellipfi defi-* 



... . ,7 zdz y/ ( c c -- bb) 



liiamus ob d yzz— - ^.^^ — T^)* 7 ^fit 



dz -f- r/j' -- vy(cc-nrr et V( Js 4-<5^j ) = — vc':-:^:^^ 

 fupra aorem inuenimus effe 



j » , j I 7 ^s , 'A c , B c A — B» 



^A- -h '/j' =4^</^ (c-T^^-i-EFTT^. " ^b) 

 quae tranfit in hanc formam : 



, t , t «?iga i^l \fr-4- a)(c'c-f-5sl-i -B(c — g}(c c-£z)) 



vnde colligimus 



*lc£S djl ^ da* (c*-^5a2gl* . ^ 



l-i-c — (cc — zajt Aic-t- z){cc'~i-bz]-*-Ue-z){cc — bz) 



Tom X.Kou.Comm. Ff hinc- 



