\[\frac{d}{dx}\left\{ \log \left( \frac{{{e}^{x}}}{1+{{e}^{x}}} \right) \right\}=\]

\[\frac{d}{dx}\left\{ \log \left( \frac{{{e}^{x}}}{1+{{e}^{x}}} \right

1.	\[\frac{d}{dx}\left\{ \log \left( \frac{{{e}^{x}}}{1+{{e}^{x}}} \right) \right\}=\]
A.	\[\frac{1}{1-{{e}^{x}}}\]
B.	\[-\frac{1}{1+{{e}^{x}}}\]
C.	\[-\frac{1}{1-{{e}^{x}}}\]
D.	None of these
Answer» E.