626 
MEMOEIAS CIENTIFICAS 1 LITERAEIAS 
J + axj adx ™ (1 + ax) d(l + ax) 
2 a 
(1 + ax)- 
2 . j = f (a — bx)- dx. Iiitroducimos 
v = 
/ (a — bx)‘^ ( — bdx) = 
— / (a — bx) d (a — bx) (a ~ bx)"^ 
I 
Xna dx = 
^/(m+l)x»dx=-^/dx 
no + 1 
Xm + 1 
ra + 1 
(De Comberousse, IV, 682 ) 
4. y 7 x"(2 + x^) = 7 J (2 + 
x^dx 
= (2 + x^)d(2 + x®;= ~ (2 + x^)^ 
5. y* 20x^(l+x®)^= J (l + x®)M (1 +x®) = 
(1 + x^)^ 
f (a+bx)^= (a + bx)«d(a + bx)= x)°t 1 
*/x D 0(11+1) 
(Hall, 222) 
Gontinuard ). 
