4
1
(
1)
x x –
21 1
(
1)
x
e –
[Hint : Put ex = t]
Choose the correct answer in each of the Exercises 22 and 23 22 (
1) (
2)
x dx
x
x
−
−
∫
 equals
(A)
2
(
1)
log
C
2
xx
−
+
−
(B)
2
(
2)
log
C
1
x
x
−
+
−
(C)
12
log
C
2
xx
−


+


−


(D) log (
1) (
2)
C
x
x
−
−
+
23