InterviewSolution
Saved Bookmarks
| 1. |
What is the derivative of `sqrt((1+cosx)/(1-cosx))`?A. `(1)/(2)sec^(2).(x)/(2)`B. `-(1)/(2)"cosec"^(2_.(x)/(2)`C. `-"cosec"^(2).(x)/(2)`D. None of these |
|
Answer» Correct Answer - B Let `y = sqrt((1+cos x)/(1-cos x))=(sqrt(2)"cos"(x)/(2))/(sqrt(2)"sin"(x)/(2))="cot"(x)/(2)` `(dy)/(dx)=-"cosec"^(2)(x)/(2).(1)/(2)=-(1)/(2)"cosec"^(2)(x)/(1)` |
|