1.

If `cos^2x-(c-1)cosx+2cgeq6`for every `x in R ,`then the true set of values of `c`is`(2,oo)`(b) `(4,oo)`(c) `(-oo,-2)`(d) `(-oo,-4)`A. `[2,oo)`B. `[4,oo)`C. (-oo,-2]`D. (-oo,-4]`

Answer» Correct Answer - B
`cos^2x-(c-1)cosx+2cge6AAx in R`
`rArr (cosx-2)(cosx-AAx in R)`
`rArrcosxlec-3`
`rArrc-3ge1`
`rArrc in[4,oo)`


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