Latex
$\omega$ \omega
$\int_0^\infty e ^ {-x^2} dx=\frac{ \sqrt{\pi} }{ 2 }$ \int_0^\infty e ^ {-x^2} dx=\frac{ \sqrt{\pi} }{ 2 }
$\frac{1}{v_o\rho^4}\underbrace{\int_{- \infty }^{ \infty } \frac{1}{\left (1+x^2\right)^2}\,\mbox{d} x}_{\frac{\pi}{2}}$ \frac{e^6}{m^2c^3}\frac{1}{v_o\rho^4}\underbrace{\int_{- \infty }^{ \infty } \frac{1}{\left (1+x^2\right)^2}\,\mbox{d} x}_{\frac{\pi}{2}}
$mv_o^2 \gg \frac{e^2}{\rho^2}$ mv_o^2 \gg \frac{e^2}{\rho^2}
$\vec{a}=\ddot{\vec{r}}$ \vec{a}=\ddot{\vec{r}}
$\frac{e^2}{\rho} \ll mv^2_o \ll mc^2$ \frac{e^2}{\rho} \ll mv^2_o \ll mc^2
$\left | \vec{a}\right |^2=\frac{e^4}{m^2r^4}$ \left | \vec{a}\right |^2=\frac{e^4}{m^2r^4}
$\partial r$ \partial r
$\vec{B}_{out} = - \nabla \phi_{out}$ \vec{B}_{out} = - \nabla \phi_{out}
(1)
\begin{align} \left ( \begin{array}{cc} a & b \\ c & d \end {array} \right ) \end{align}

\left ( \begin{array}{cc}
a & b \c & d \end {array} \right )

(2)
\begin{align} \left | e^{\imath \bf{k} \cdot \bf{ x} }\right| \end{align}

\left | e^{\imath \bf{k} \cdot \bf{ x} }\right|

From arXiv.org — how to strip comments from a tex file

perl -pe 's/(^|[^\\])%.*/\1%/' < old.tex > new.tex
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