40 
MEMORIAL CIENTIFICAS 1 LITER ARIAS 
4 z-±f( 
J sen x 2 J V 
1 r( d — cos x 
d cos x 
1 cos x 1 + cos x 
1 T 1— cos x T 1 
=-- - - L _ = L tff — x 
2 7+cosx b 2 
16. f — — d x = l f[*22*x 
J cos x 2 J \ 1 + sen x 1— sen x J 
L (1 4- sen x) — L (1 — sen x) 
v: 
1 + sen x 
sen x 
- = L cot 
( 1 1 \ 
T X “T X J 
(Id., id.) 
17 
. f 
J sen x J 
.,i „ i 
sen- — x -h cos- — x 
U Ll 
71 — 
4 sen- — x cos 2 x 
— Jj 
1 f T dx i r T dx 
2 J cos 2 -l x 2 J sen 2 -L 
-r(*4- x - 
. 1 \ 
cot V X 1 
(De Longchamps, 643) 
18. 
dx 
sen x cos x 
-/■ 
sen 2 x7cos 2 x 
sen x cos x 
d x 
