rendering mathml is far from trivial. it's a very large spec with very few open source standalone implementations outside of browser engines, and even there it is being removed from browser engines. So you are left with JS based solutions like mathjax, which is what for instance the calibre viewer uses. IIRC calibre's PDF output has suport for using MathJax when converting to PDF, so you might be better off converting to PDF (sized for your device screen).
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