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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) uu [(1)/(3), oo)`

D

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

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