[Tex/LaTex] Make figure stick out past the margin

marginswrapfigure

I want to use wrapfig to insert a figure which sticks out into the margin. This does not work, it causes the figure to appear at the end of the text:

{\addtolength\textwidth{1in}
\begin{wrapfigure}{r}{0.5\textwidth}
\begin{center}
\includegraphics[width=0.48\textwidth]{funcimmet1.pdf}
\end{center}
\caption{Graph of $2{{\sin }^{2}}x-1$}
\end{wrapfigure}
}


This makes the picture bigger but it doesn't stick out, it eats up more space to the left:

\addtolength\textwidth{1in}
\begin{wrapfigure}{r}{0.5\textwidth}
\begin{center}
\includegraphics[width=0.48\textwidth]{funcimmet1.pdf}
\end{center}
\caption{Graph of $2{{\sin }^{2}}x-1$}
\end{wrapfigure}


How can I do this?

[number of narrow lines] {placement} [overhang] {width of figure}
The figure sticks into the margin by overhang', if given.
`