\subsection{tan}
\label{labtan}
\noindent Name: \textbf{tan}\\
\phantom{aaa}the tangent function.\\[0.2cm]
\noindent Library names:\\
\verb|   sollya_obj_t sollya_lib_tan(sollya_obj_t)|\\
\verb|   sollya_obj_t sollya_lib_build_function_tan(sollya_obj_t)|\\
\verb|   #define SOLLYA_TAN(x) sollya_lib_build_function_tan(x)|\\[0.2cm]
\noindent Description: \begin{itemize}

\item \textbf{tan} is the tangent function, defined by $\tan(x) = \sin(x)/\cos(x)$.

\item It is defined for every real number $x$ that is not of the form $n\pi + \pi/2$ where $n$ is an integer.
\end{itemize}
See also: \textbf{atan} (\ref{labatan}), \textbf{cos} (\ref{labcos}), \textbf{sin} (\ref{labsin})
