\subsection{tanh}
\label{labtanh}
\noindent Name: \textbf{tanh}\\
\phantom{aaa}the hyperbolic tangent function.\\[0.2cm]
\noindent Library names:\\
\verb|   sollya_obj_t sollya_lib_tanh(sollya_obj_t)|\\
\verb|   sollya_obj_t sollya_lib_build_function_tanh(sollya_obj_t)|\\
\verb|   #define SOLLYA_TANH(x) sollya_lib_build_function_tanh(x)|\\[0.2cm]
\noindent Description: \begin{itemize}

\item \textbf{tanh} is the hyperbolic tangent function, defined by $\tanh(x) = \sinh(x)/\cosh(x)$.

\item It is defined for every real number $x$.
\end{itemize}
See also: \textbf{atanh} (\ref{labatanh}), \textbf{cosh} (\ref{labcosh}), \textbf{sinh} (\ref{labsinh})
