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

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

A

1)`[1/3 , 1]`

B

2)`[-1, 1/3]`

C

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

D

4)`[-1/3 , 1]`

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The correct Answer is:
C
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