math support for hexo

_ in Markdown conflicts with that in Latex, here is the solution to it:

Hexo uses Nunjucks to render posts (Swig was used in older version, which share a similar syntax). Content wrapped with {{ }} or {% %} will get parsed and may cause problems. You can wrap sensitive content with the raw tag plugin.

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{% raw %}
$$
e^{i theta_{t}} = cos theta_{t} + i sin theta_{t}
$$
{% endraw %}

Results

$$
e^{i theta_{t}} = cos theta_{t} + i sin theta_{t}
$$

Ref: https://hexo.io/docs/troubleshooting.html#Escape-Contents