(A) (0,1)
(B)
 π2,
π 
 
 
 
 
(C)
0, 2
π
 
 
 
 
 
 
(D) None of these
14 For what values of a the function f given by f (x) = x2 + ax + 1 is increasing on
[1, 2] 15 Let I be any interval disjoint from [–1, 1]