# Let’s demo some exporting features

This is one of Maxwell’s equations:

$\mathrm{\nabla }×E=-\frac{1}{c}\frac{\mathrm{\partial }H}{\mathrm{\partial }t}$

This is the definition of a derivative:

$\frac{df}{dt}=\underset{h\to 0}{lim}\frac{f\left(t+h\right)-f\left(t\right)}{h}$

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