Range of f(x) = (1)/(1-2 cos x ) is :...

Range of `f(x) = (1)/(1-2 cos x )` is :

A

`[(1)/(3),1]`

B

`[-1,(1)/(3)]`

C

`(-oo,-1]cup[(1)/(3),oo)`

D

`[-(1)/(3),1]`

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The correct Answer is:

B

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