f(x) =

















3


  ____
x2+1
 

  


g
 
+
X

W  
f(x) dx
 
;
x Y
b

a  
a

b  





z
D
:
:
x
l





;
x
1
3+ 2
2+ 1
3
;
xQ


File translated from TE X by TT H, version 2.01.
On 1 Jan 1980, 02:11.