The quick brown fox x^2 = 1 jumped over the lazy dog.
The quick brown fox -\frac{1}{\mu_o}\nabla^2 A = J jumped over the lazy dog.
\[ \large -\frac{1}{\mu_o}\nabla^2 A = J \]
\textstyle \Large
\sqrt{x+2}\quad \underline 4\quad \overline{x+y}\quad
x^{\underline n}\quad x^{\overline{m+n}}
\quad \sqrt{x^2+\sqrt{\alpha}}
\textstyle \Huge
\root 3 \of 2 \quad
\root n \of {x^n+y^n}\quad
\root n+1 \of k
\[ \label{blahblah} \begin{array}{ccll}
f_x & = & \frac{\pi l R}{4 \mu_o} B_j B_k \cos (\phi_j-\phi_i) & \; \mbox{if} \; |j-k| =1 \\
& = & 0 &\; \mbox{if} \; |j-k| \neq 1
\end{array}\]
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\[ \sqrt{ \frac{k \left( m+M\right) }{m M} }\]
\[\begin{eqnarray}
a &=& \frac{1}{2}b+c+d = e \\
f &=& \frac{2}{3}g+h = i+j+k
\end{eqnarray}\]
\[ \int\int \]