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-\section{Built-in Module \module{cmath}}
-\label{module-cmath}
-
-\bimodindex{cmath}
-This module is always available.
-It provides access to mathematical functions for complex numbers.
-The functions are:
-
-\begin{funcdesc}{acos}{x}
-Return the arc cosine of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{acosh}{x}
-Return the hyperbolic arc cosine of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{asin}{x}
-Return the arc sine of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{asinh}{x}
-Return the hyperbolic arc sine of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{atan}{x}
-Return the arc tangent of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{atanh}{x}
-Return the hyperbolic arc tangent of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{cos}{x}
-Return the cosine of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{cosh}{x}
-Return the hyperbolic cosine of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{exp}{x}
-Return the exponential value \code{e**\var{x}}.
-\end{funcdesc}
-
-\begin{funcdesc}{log}{x}
-Return the natural logarithm of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{log10}{x}
-Return the base-10 logarithm of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{sin}{x}
-Return the sine of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{sinh}{x}
-Return the hyperbolic sine of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{sqrt}{x}
-Return the square root of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{tan}{x}
-Return the tangent of \var{x}.
-\end{funcdesc}
-
-\begin{funcdesc}{tanh}{x}
-Return the hyperbolic tangent of \var{x}.
-\end{funcdesc}
-
-The module also defines two mathematical constants:
-
-\begin{datadesc}{pi}
-The mathematical constant \emph{pi}, as a real.
-\end{datadesc}
-
-\begin{datadesc}{e}
-The mathematical constant \emph{e}, as a real.
-\end{datadesc}
-
-Note that the selection of functions is similar, but not identical, to
-that in module \code{math}\refbimodindex{math}.  The reason for having
-two modules is, that some users aren't interested in complex numbers,
-and perhaps don't even know what they are.  They would rather have
-\code{math.sqrt(-1)} raise an exception than return a complex number.
-Also note that the functions defined in \code{cmath} always return a
-complex number, even if the answer can be expressed as a real number
-(in which case the complex number has an imaginary part of zero).