How can i show a preloder like [loading...] until the Maths is typeset fully.Now the TeX code is shown as such until the typesetting is over.
You can use
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
tex2jax: {
preview: ["[loading...]"]
}
});
</script>
to use [loading...]
instead of the TeX code as the preview. See the tex2jax configuration documentation for details.