1

What should I do to enter the following equation in LaTeX?

enter image description here

2

This should do it.

\documentclass{article}
\begin{document}
\begin{equation}
AP = \frac{100}{\frac{1}{\left(\frac{\delta^{13} C}{1000} +1\right)x ARC} +1}
\end{equation}
\end{document}

Edit: As suggested by Steven B. Segletes, you can also try

\documentclass{article}
\begin{document}
\begin{equation}
AP = \frac{100}{\frac{1}{\left(\frac{\delta^{13} C}{1000} +1\right)\times ARC} +1}
\end{equation}
\end{document}
  • 1
    Suggest \times ARC rather than x ARC – Steven B. Segletes Feb 25 at 0:46
  • I wasn't sure if that cross-looking glyph was a normal x in that font or a \times operator. I'll add you suggestion for completeness. – noibe Feb 25 at 0:49
  • \delta does not work in the equation, but everything else works well - thank you! – mef022 Feb 25 at 0:50
  • 1
    @mef022 it's quite odd that a simple \delta would give problems. – noibe Feb 25 at 0:53
  • 1
    @mef022 I think the problem is your TeX installation, try uninstalling everything and doing a new clean installation. Never heard of greek letters giving problems. It's probably unrelated but try using the amssymb package – noibe Feb 25 at 1:12

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