# [Tex/LaTex] Underbrace outside parentheses

alignatequationsmath-modeunderbrace

How do I move the underbrace out of the big parentheses while still keeping it underneath the term?

\begin{alignat*}{4}
& \frac{E_{0-0}}{hc} &&= C+\frac{E'(\upsilon'=0)}{hc} &\\
&                    &&\approx C+\frac{\omega'_e}{4\pi c}
\end{alignat*}


I replaced alignat* with just align* as others also said and \Bigl,\Bigr are also better. The \frac{1}{2} looks unnecessarily big, so I used \tfrac. Finally, to lower the underbrace you can add a virtual rule like \vphantom{\rule[-1em]{0pt}{0pt}} noting that a \smash is required to keep line spacing consistent.

\documentclass{article}
\usepackage{amsmath}
\begin{document}

\begin{align*}
\frac{E_{0-0}}{hc} &= C+\frac{E'(\upsilon'=0)}{hc} &\\