InterviewSolution
Saved Bookmarks
| 1. |
Evaluate, `lim_(xto(pi//6)) (cot^(2)x-3)/("cosec"x-2)`A. `2`B. `3`C. `4`D. `5` |
|
Answer» Correct Answer - C Given, `underset(xto(pi//6))"lim"(cot^(2)x-3)/("cosec"x-2) = underset(xto(pi//6))"lim"("cosec"^(2)x-1-3)/("cosec"x-2)` `[therefore"cosec"^(2)x=1+cot^(2)x]` `=underset(xto(pi//6))"lim"("cosec"^(2)x-4)/("cosec"x-2)=underset(xto(pi//6))"lim"(("cosec"x)^(2)-(2)^(2))/("cosec"x-2)` `=underset(xto(pi//6))"lim"(("cosec"x+2)("cosec"x-2))/("cosec"x-2)` `="cosec"pi/6+2=2+2=4` |
|