15.
|
A. ln (1 + e-1) |
B. - ln (1 + e-1) |
C. ln (1 + e) |
|
D. arctan (e1/2) |
E. does not exist |
|
Solution: The answer is A
The given integral,
is an improper integral whose value is given by,
Letting,
Thus, taking the limit as b goes to infinity yields,
