Derivative
@[@
\begin{array}{lcr}
\R{tanh}^{(1)} (x) & = & 1 - \tanh (x)^2
\end{array}
@]@ Example
The file
tanh.cpp
contains an example and test of this function.
It returns true if it succeeds and false otherwise.
Input File: cppad/core/std_math_98.hpp