1

How do I write this formula in latex?
enter image description here

I tried this:

\big(f(x,b)\big)'_x|_{x=a}

enter image description here

but the result is different from what I want (the line is shorter).

I understand that this is probably a simple question but I can't find the answer probably because I can't find good words for the search

3
  • 2
    \left.\bigl(f(x,b)\bigr)'_x\right|_{x=a}?
    – user241266
    May 5, 2021 at 1:34
  • @user241266 thanks! It's what I want May 5, 2021 at 1:38
  • For a pretty exhaustive discussion, also see tex.stackexchange.com/q/294499/158639 .
    – chsk
    May 5, 2021 at 7:32

2 Answers 2

2

As posted in comments by user241266, the correct thing to do is

\left.\bigl(f(x,b)\bigr)'_x\right|_{x=a}
1

You probably want something like

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\[
\bigl(f(x,b)\bigr)'_x\Big|_{x=a}
\]

\end{document}

enter image description here

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