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The range of f(x)=(1-tan x)/(1+tan x) is...

The range of `f(x)=(1-tan x)/(1+tan x)` is

A

`(-oo, oo)`

B

`(-oo, 0)`

C

`(0, oo)`

D

`(-oo, -1) uu (-1, oo)`

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The correct Answer is:
A
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