Saved Bookmarks
| 1. |
If equation `(cos^(-1)x)^(4)-8(cos^(-1)x)^(3) + a (cos^(-1)x)^(2)+b (cos^(-1)x)+16=0` has four positive real roots, where a, b epsilon R then `[x]` = (Where [.] G.I.F.)A. `1`B. `0`C. `-1`D. `2` |
|
Answer» Correct Answer - C All th roots of given equation are equal therefore `cos^(-1) x=2` `therefore x = cos 2` `[x]=[cos 2] =-1` |
|