2
2
2
1
1
–1
2
x
e dx
x
x






∫
Choose the correct answer in Exercises 9 and 10 9 The value of the integral 
3 31
1
1
4
3
(
)
x
x
dx
−x
∫
 is
(A) 6
(B) 0
(C) 3
(D) 4
10 If f (x) = 
0
x tsin
t dt
∫
, then f′(x) is
(A) cosx + x sin x
(B) x sinx
(C) x cosx
(D) sinx + x cosx
INTEGRALS         341
7