LOS METODOS DE INTEGKACION 
53 
'<• y 
f d x [ d z , , 
r = / . — = / r r = arc sen (a + x) 
J 1 —(a + x) 2 J t/i—z^ 
]/ 1 — z; 
(De Freycinet, 108) 
8. y 
H 
x d x 
a^ + x“ 
Sea a 2 + x 2 = z . •* . xdx = *4- d z 
±[ . 
2 / 
-/• dz 
2 / z 
Lz = L ]/ a 2 
+ xs 
(Cournot, II, 2) 
9. y = [ — g— X • • Sea xl 4” p = t(q p' 2 )- 
J x 2 + p x + q 2 4- r 
. dx= dt 
l/V-T 
(Serret, II, 16) 
10 . 
/■ 
d x 
a + 2 b x + c x 2 
/■ 
c d x 
(e x + b) 2 + ac — b 2 
Sea 
