The following under determined equation \(Ax=b\) is an example.
Trying \(x_1 = 3\)
\begin{equation}
\int_a^b \! f(x) \, \mathrm{d}x
\label{eq.gaussian}
\end{equation}
which we can later refer back to as \eqref{eq.gaussian}.
In equation \eqref{eq:sample}, we find the value of an
interesting integral:
\begin{equation}
\int_0^\infty \frac{x^3}{e^x-1}\,dx = \frac{\pi^4}{15}
\label{eq:sample}
\end{equation}
Very cool indeed.
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