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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]`

Text Solution

Verified by Experts

The correct Answer is:
B
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