878 
MEMORIAS CIENTIFICAS I LITERARIAS 
y a b 
y: 
^ arc sec l/ (Perry, 28) 
11 
r —dx . 1 
J + x 2 a 
arc cot 
X 
12 . 
r ^ 1 
[' 1 
1 a'2-(-b^x2 j 
j X 
n 
= — 7 " arc tg — X 
ab a 
13. 
/. a‘ + x‘ 2 J; 
2 x 1 x 2 
+ x^ 2 I (a^)^+(x^)^- " 2 a^ ^ a^ 
14. 
L 
b^ + X' 
L[ -_i_ arete- — 
2 b‘-‘+(x 4 " “ 2 ab^^^ab 
III. Forma. 
du 
y 1 — u= 
arc sen u 
15. 
r dx 1 
' dx 1 
r -- 
J 
l.y.-f-f) ' 
n/‘-(-r)‘ 
= are sen 
X 
a 
