InterviewSolution
Saved Bookmarks
| 1. |
`int 1/(1+cosx) dx=`A. `-cot x + cosec x + C`B. `cot x - cosec x + C`C. `cot x + cosec x + C`D. none of these |
|
Answer» Correct Answer - A `I = int{(1)/((1+cosx)) xx ((1-cosx))/((1-cosx))} dx = int((1-cosx))/(sin^(2)x) dx` `= {(-1)/(sin^(2)x) - (cosx)/(sin^(2)x)} dx = int(cosec^(2)x - cosec x cot x ) dx`. |
|