1

This question already has an answer here:

I would like to create something like thisthis.

Specifically my question is about how those curly braces below are drawn and labelled.

marked as duplicate by Mico equations Jun 11 '18 at 8:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • 2
    Have you considered the \underbrace macro? – Mico Jun 11 '18 at 8:12
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equation is not complete (since you not provide code mwe), but finish it should not be a problem to you

\documentclass{article}

\begin{document}
\[
\int\underbrace{\int_0^\pi \frac{2y}{R^2}\left( ... \sqrt{1-\frac{y}{4}}\right)dy}_{\mathcal{A}} dx
\]
\end{document}

enter image description here

  • Its very clear, thanks @Zarko! +1 – Abdulhameed Jun 11 '18 at 8:14

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