i66 Opusculaa 
confiat d> = ttlll : ergo dl' = Q±Zilll + i'/ ■ 
Simiiiter ds^^^~l^JL : igitur fubftituendo 
AC^ AC- ^ b7 'y dl^ ^ ""^'l a4^ C- 
-f- AQ/C'^^ H- BQ^G'^/* , five contraais formulis ; 
mm dy z=L dy 
\ .K2 X 
AC' -I- AG'-4- B/.y = AQ'C'^/H- 
- . 
A B . Q" C dy^ 
iiC H- AC -t- Bc . y (^Pf = AQ C 4- 
^ y 
A-f-B. q'G'J^': atqui ds"" =z d fc' dy , & J^=^^a5^ 
d : ergo 
AG^ -I- AC^ -f- B / = AQ^ C^ dpc' H- ^^'t^^''^ '' 
» — _____ '3 
A + A 4- B . Q^Ci/ ^ 
_ y 
A -f- A -h B . Q' C' . Quare 
l/ 
'2 Aa 3 
j AC*4-AC*4-Bc\/-AQ'C*-'^-^^^T^ 
\ 
