(
)
2
(
1)
log
x
x
x
x
+
+
37 (
)
3
1 4
sin tan
1
–
x
x
x8
+
Choose the correct answer in Exercises 38 and 39 38 10
9
10
10
10 log
10
x
e
x
x
dx
x
+
+
∫
 equals
(A) 10x – x10 + C
(B) 10x + x10 + C
(C) (10x – x10)–1 + C
(D) log (10x + x10) + C
39