54 
MEMOEIAS CIENTIF1CAS I L1TERARIAS 
y 
o y 
11. y 
f 
12. y 
c x + b=z 
d x = — dz 
c 
/■ 
d z 
a c— b 2 + z* i/ a e — b 2 
1 cx + b 
=. arc tg 
V a e — b 1 
x + b — i b 2 — 
a c 
/b 2 -ac cx + b + -|/*b 2 
a c 
(Roberts, 11) 
d x 
(x — a) (x — b) 
Seax=- (a + b) + z . * .dx = dz, 
x— a = z+ — (b — a) 
x — b = z — (b —a) 
(x — a) (x — b) = z 2 — (b — a) 2 
1 x — a 
a — b x— b 
5x 3 
3 4 x+ 7 
Sea 3x 4 + 7 = t . 
x 3 d x = 
12 
d t 
5 /- d t 
12 J t 
o 
12 
(3 x 4 + 7) 
(Sturm, 317) 
