Multiple label definition

[GiulioRomualdi]

Hi @orsharir, I have an issue when I add the command \label{} to the environment equation.
In details when I create an equation as follows, I retrive the error Label 'eq:test' multiply defined.

\begin{equation}
\label{eq:test}
sin^2(x) + cos^2(x) = 1
\end{equation}

\begin{equation}
\label{eq:test}
sin^2(x) + cos^2(x) = 1
\end{equation}

Unfortunately, I notice that the problem happens when the equation is cited by using the command \eqref{} e.g. \eqref{eq:test}
Do you know why this is happening? Do you have any suggestions to fix the problem?

[muzimuzhi]

I can re-produce your problem when referring to any label by \ref or \eqref.

This may relates to the following "feature" of MathJax

If you are using automatic equation numbering and modifying the page dynamically, you can run into problems due to duplicate labels. See Reset Automatic Equation Numbering for how to address this.

ref: http://docs.mathjax.org/en/latest/tex.html#automatic-equation-numbering