870 
MEMORIAS CIENTIFICAS I LITERARIAS 
2 j 3 
(x^ 4 -a^) V d X = 
y (x"+a")“ . 
(Stone, Ap. 32 ) 
27 
. j ]/c^ — x^ |-J u “T du= ]/(c 
2 _x^)a 
(Hutton, I, 483 ) 
28 . 
29 . 
x 2 + 3 = — ( 4 x 2 + 3 )T 
j 6 x y 4 
J y 1 — a^x^ a J 
(a x)‘^] ~T d (a x) 
arc . sen a x 
30 . 
/• 
dx 
(l-ax)i l/ajj/i_(yTx)^ 
d/ 
a X 
y a 
arc. sen 
}/ a X 
31 . j x(a 2 +x 2 )- 2 d X = j 
(a2+x2)T“ d(a2 + x^)=j 
/ 
a^ + X 
32. 
f ^ f (a^ — *bx^)“ 2 d( — 2bxdx 
J]/a^ — bx^ 2b J 
= 2 l/a^ — b x^ 
I 
