Consider this markup:

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* MATHEMATICS AUXILIARY

** deriving sines and cosines

#+caption: Right triangle with two $\pi\big/4$ angles.

[[file:images/45-45-triangle.png]]

$\big/$

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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?