I think you have two options. One is to rewrite the input as a valid Mathematica expression e.g. using Derivative
, Integrate
and the like rather than the palette formatting for FractionBox
, PartialD
etc., and then apply TeXForm
. The alternative is to take the entire notebook and do File > Save As > LaTeX Document. I did this latter and show the result below. It would probably require a bit of tweaking but it might be useful as a start.
%% AMS-LaTeX Created with the Wolfram Language : www.wolfram.com
\documentclass{article}
\usepackage{amsmath, amssymb, graphics, setspace}
\newcommand{\mathsym}[1]{{}}
\newcommand{\unicode}[1]{{}}
\newcounter{mathematicapage}
\begin{document}
\begin{doublespace}
\noindent(\pmb{\frac{\partial u}{\partial t}-\hat{v}\circ \nabla u-v\left(\mu a+\mu s\right)u+\int \text{v$\mu $}sps\left(\Omega '\rightarrow
\Omega \right)u\left(r,\Omega ',t\right)d\Omega '+q(r,\Omega ,t)})
\end{doublespace}
\end{document}