I have a fraction in the denominator of another fraction, and I'm trying to put a set of brackets around it. However, I can't seem to get them to size properly. Example below:(adsbygoogle = window.adsbygoogle || []).push({});

which comes out asCode (Text):Q_1 \left[ \frac{Q_2}{4\pi \left( r_2+\sqrt{ \dfrac{Q_2\gamma A}{4\pi}} \right)^2 } + Q_3 \right]

\begin{equation}

Q_1 \left[ \frac{Q_2}{4\pi \left( r_2+\sqrt{ \dfrac{Q_2\gamma A}{4\pi}} \right)^2 } +Q_3\right]

\end{equation}

Obviously, I want to get rid of the space at the top. I've tried using \Bigg[ (which ends up too small) and even creating my own sizing in the preamble:

(which ends up too big since it only accepts integer sizing, as far as I can tell). Any ideas? Thanks.Code (Text):\makeatletter

\newcommand{\vast}{\bBigg@{4}}

\makeatother

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# Parentheses around mismatched size fractions in LaTeX

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