892 
MEMORIAS CIENTIFICAS 1 LITER ARIAS 
1 1 + 2 COS X 
arc cos 
1/3 
d + cos X 
16. 
17. 
d X 
l/3+tg-|- X 
j 1 + 2 cos X 
yr-t 
1 
^g~x 
f dx _ r 
dx 
J 1 + COS^X J 
cos^x (1 + sec“-x) J : 
u 
d u 1 
/ y2 
1 
sec* d X 
2 -fir 
1/2 
tg'X 
arc tg 
1/2 y 2 
>*■ / 
d X 
dx 
a + cos‘-^x cos- X (1 + a sec“ x) 
_ r d tg X _ r d u 
~~ J l-[-a+atg“x ~J m+nu^ 
arc tg 
tgx 
19. [■ 
d X 
a-f b sen x 
]/a"-|~a y K l~l~a 
Se reduce a la forma anterior: 
a+b sen x=a — b+b(sen‘^ — x+cos^ x) 
-f- 2 b"sen 
1 1 
— xcos-^x 
