LOS METODOS DE INTEGKACION 
59 
r 1 i 
y = / e z . - d z = — - e ax 
j a a 
29. v == f e~ a x d x= — — fe 7 d z — e~ J 
30. /e*(*> df (x) = /e z dz = e*« 
(Moigno, II, 12) 
/* ox v rl v 
31. y = 
32 - /- 
dx 
+ e x 
e x x dx 
Sea 
1 +x = 
(l+x) 2 
e z / d z 
d z > 
v e z 
e V z 
' ez 
— Sea 
1 + e x = 
=z 
dz 
d z 
z 2 
z 
1+x 
(Francoeur, 374) 
z~i = 
— 1 
1 + e x 
33. 
/ 
d x 
e x +Q—X 
• Sea e x =y 
X 'J 
d x = e— x d v 
y 
d z 
(z + Z— 1 ) 
/■ 
d z 
z 2 + 1 
= arc tg e x 
(Byerly, II, 36) 
