Let \( f: \mathbf{R} \rightarrow \mathbf{R} \) be given by \( f(x)=...

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Let \( f: \mathbf{R} \rightarrow \mathbf{R} \) be given by \( f(x)=\tan x \). Then \( f^{-1}(1) \) is
(A) \( \frac{\pi}{4} \)
(B) \( \left\{n \pi+\frac{\pi}{4}: n \in Z\right\} \)
P
(C) does not exist
(D) none of these
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