InterviewSolution
Saved Bookmarks
| 1. |
The number of solutions of the equation `cos^(2)((pi)/(3)cos x - (8pi)/(3))=1` in the interval `[0,10pi]` isA. 1B. 3C. 5D. 7 |
|
Answer» Correct Answer - C `cos^(2)((pi)/(3)cos. X-(8pi)/(3))=1` `rArr (pi)/(3)cos. X-(8pi)/(3)=k pi, (k in Z)` `rArr cos x = 3k + 8, k in Z` `rArr cos x = -1`, when `k = -3` `rArr` there are 5 solutions for `x in [0, 10pi]` |
|