1.

The set of all values of a for which the functioln f(x) =(a^2-3a+2) (cos ^2x//4- sin ^2x//4)+ (a-1) x + sin 1 does not possess critical points is

Answer»

`[1,OO]`
`(0,1)CUP(1,4)`
`(-2,4)`
`(1,3) cup (3,5)`

ANSWER :B


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