The inverse of the function \( f: R \rightarrow\{x \in R: x1\} \)
\... VIDEO
The inverse of the function \( f: R \rightarrow\{x \in R: x1\} \)
\( \mathrm{P} \)
given by \( f(x)=\frac{e^{x}-e^{-x}}{e^{x}+e^{-x}} \), is
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(1) \( \frac{1}{2} \log \frac{1+x}{1-x} \)
(2) \( \frac{1}{2} \log \frac{2+x}{2-x} \)
(3) \( \frac{1}{2} \log \frac{1-x}{1+x} \)
(4) None of these
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