tso D E M O T V 



:ez=/+X(cora'-l-rin.a'cof.(|))4-Y(cor.rtCor.(3(i-cor0)-cofYrin.0) 

 4- Z (cof. a cof. Y ( I - coi. 0) -i- coi; p a n. Cp) 



j=g-|-Y (cof j3'4-rin.p'cof (p,4-Zfcof.(3cof.Y( i-cor(t))-cof.a fin.0) 

 -H X (cof. a cof. ^ ( I - cof. (|)) -|- cof. y fin. (p) 



5;— /^'-t-ZCcof.y^+fin.v^cufCpHXCcofacofY^i-cofCp^-cof.l^fin.Cl); 

 4- Y (cof p cof. Y ( 1 - cof. Cp) -i- cof a fin . Cp). 



^. 22. Quoniam autcm inae expreniones ni- 

 mis funt complicatae, ponamus breuiratia gratia 



X = / -+- F X -H F' Y -j- F" Z 

 j':=^-f-GX-f-G'Y-4-G"Z 

 5:=rZ?-|-HX-+-H'Y-i- H" Z 

 ita Tt fit 



F ■=. cof. a' -h f.n. a' coC Cp 



G — cof. a cof. (3 (i - cof Cp) -f ccf. y fin. Cp 



H — cof. a cof Y (^ " ci»f 0) — coi! (3 fm. Cj) 



F" — cof. a cof. Y (i - cof Cp) -f col. f3 fir. Cp 

 G"=r cof. (3 cof Y (' — cof Cp) - cof a fm. Cp 

 H'' — cof y' -H <»"• V' col. Cj). 

 §. 23. Cum iam dillantia puncli iz ctiam- 

 niinc aequalis efTe dcbcat diftantiae l Z, idooque 

 {X -/; -i- ( y -gy -h (:: - h)' -X'-\-Y'-^Z\ 

 calculum inftituendo compcrictur rcucra f(ue 

 FF-|-GGh-HH=:i FF'H-GG'-hH H'rro 

 F'F'-l-G'G'-i-H'H'=:i t'F"H-G'G"-f-H'H"-o 

 F"F "-4-G" G" 4- H" H"- I F F"-i- G G" ^ H H"rr o. 



Atquc 



