The range of k for which the inequaliit...

The range of k for which the inequaliity `kcos^2x-kcosx+1>=0 AA x in(-oo,oo) is`

A

`k lt ( -1)/(2)`

B

`k lt 4`

C

`(-1)/(2) le k le 4`

D

`1/2 le k le 5`

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The correct Answer is:

C

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