I was using cdn path for MathJax file, but it was not working. So as suggested on https://groups.google.com/forum/#!topic/mathjax-users/aDIAR8ZxneI , I installed MathJax file locally and included in index.html In web it still works fine, but in cordova app the MathJax file is not included.
In cordova, no need to install mathJax. Including mathJax in following way fix the issue/error.
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
// add your configuration, see following for example
showProcessingMessages: false,
tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]}
});
</script>
<script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"> </script>
Including file as "//cdn.mathjax.org/..." or "https://cdn.mathjax.org/..." will not include mathJax file.