Displayed equation in quote not displayed

  • Topic: Bug 
  • Thread starter pasmith
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For some reason, the second displayed equation in the quote in this post is not being displayed.

I can see when I edit the post that the LaTeX is there and is correct, but neither the LaTeX code nor the rendering thereof appears when looking at the post.
 
Forum quote with two transcendental equations: tan(ka) = -h²k/(mα), and h²k/(mα) = square root of 1/(2cos(2ka)+2), followed by a derivation comparing them with -tan ka = ±(1/2)|sec ka|.