Consider this markup:

------------
* MATHEMATICS AUXILIARY

** deriving sines and cosines

#+caption: Right triangle with two $\pi\big/4$ angles.
[[file:images/45-45-triangle.png]]

$\big/$
------------

If I remove the second $\big/$, the first latex, $\pi\big/4$, in the
caption will not properly render on export to html. Include it and both
render just fine. Without the second, the first looks like this:

Figure 1: Right triangle with two \(\pi\big/4\) angles.

Is this a bug?

LB