74 
MEMQRIAS CIENTIFICAS I LITER ARIAS 
8 . 
/ 
dx 
J x 2 ± 1 
■ Sea x-2zbl = u 2 
2 x d x = 2 udu 
d (x + u) __ d x 
+ x/ X 2 dz 1 
d x 
/x 2 dh 1 
= L (x+ x/ x 2 ± 1 
(Jarrett, 123) 
dx 
X-- Vl+X 3 
Sea x— 2 + 1 = t‘- 
J X 2 + 1 
x 
10 . 
[ dx___ = f 
J (a 2 +x 2 )-r J 
dx 
d t 
(a 2 +x 2 )~ J x 3 (a 2 x— 2 + 1)V 
- dt =--F 
i 2 Va 2 +x ! 
11 . 
d x 
J I.x- a) (X- /3) 
. • Sea x — a = z 
d x 
= 2 d z, 
