98 
A 3 + A 2 B 4 - 2 AC -f GD 
4~ (A* B -|- 2A 2 C -f G AD).x 
G AD) . x , . Çi(o) t 
4- A z Dx 3 j 
4- (A 3 C 4- 3 A 2 D)x 2 
atque sic tandem 
A*t( 1 4 “ fix 4 * Cx 2 4 ~ Dx 3 ) 
( A 3 + A 2 B + 2 AC G D \ 
4- (A 3 B + 2A 2 C 4- 6aD)x \ 
4- (A 3 C 4- 3 A 2 D)x 2 4 - A 3 Bx 3 j 
Porro, cum sit (p — q>(o). ß-Ax. v r 
fiet utique per diflferentiationem 
. . ( 42 ) 
Ideoque, cum per aequationem (17) 
fiet adeo 5 substitutione facta ? 
— r 
ideoque pro .v — n 
T ^(ir) = r ^l Ar -(^)} ~ v 
