Trying out Math on Blogger

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.