& invenies 
fcd qds — yd^, qds-=:2ydx. Igitur • 
AC- + AC' + B = AQ^cW > iO! C^-O^ 
y 'ix y dx ^ '^^ 
Vd^ 
fed patet = ^^-^ . five ^ = 42^1. fi,, ' 
^C^ QC^ ^ ^ ^^^^ dy-dy, conftat elTe = , 
Opportunis itaque fadis fubftitutionjbus fit 
AC + AC' + B = ^Q^' AC^cl/: + 
y dx y" ix y dx 
AC^ + AC^ + Bc^ ^^^^^^H. 20!^. 
I3 .U I j i, ^ 'i ,1» * 
y o,x y dx y iix 
___________ X I I 
five AC'-h A C' H- Bg^ / i^' - h(t d s' -4- A C' 
-4- B q; C* dy^ AC* -f- AC* 4- B .y dx-:^ AQ^ C* ds' + 
I I, ', I2 '3 I, 
^Q^^CJj -hBQ^C dy\ 
Quoniam j; datur per j, & vice verfa , vel enlm xqm^ 
les flint , vel differunt per quantitatem conftantem , ut dux 
sequationes quaelitarum curvarum exhibeant naCuram , fatis eft 9 
ut ex prima arceatur ds^ ex fecunda ds. Ex fuperioribus 
con- 
8 
